Pregnancy Week Calculator — How Many Weeks Pregnant Are You?

Interpreting Your Pregnancy Week

Knowing your current pregnancy week helps you track your baby's development, prepare for prenatal appointments, and understand what changes to expect in your body. Each week brings new milestones and developments. Your healthcare provider will use your gestational age to schedule important screening tests, assess fetal growth, and plan for delivery.

Remember that pregnancy dating is an estimate — even with accurate LMP recall, the actual date of conception can vary by several days depending on when ovulation occurred. A "term" pregnancy spans 37 to 42 weeks, and the due date is simply the midpoint of this window. Only about 5% of babies are born on their exact due date, and being a week early or late is entirely normal.

Lifestyle Guidance Through Each Trimester

First Trimester (Weeks 1–13)

The first trimester is a period of rapid development. Major organs, the neural tube, and the placenta begin to form. Common symptoms include fatigue, nausea (morning sickness), breast tenderness, food aversions, and frequent urination. Your first prenatal visit typically occurs between weeks 6–10, which includes confirmation of pregnancy, blood work, and an initial ultrasound.

• Start taking a prenatal vitamin with at least 400 mcg of folic acid daily, ideally before conception and continuing through the first 12 weeks to prevent neural tube defects.
• Eat small, frequent meals to manage nausea. Crackers, ginger tea, and bland foods can help. Stay hydrated, especially if vomiting is frequent.
• Avoid alcohol, tobacco, and recreational drugs entirely. Limit caffeine to 200 mg per day (about one 12 oz cup of coffee).
• Get adequate rest — fatigue in the first trimester is normal due to rising progesterone levels. Aim for 8–10 hours of sleep per night if possible.
• Be aware of warning signs: severe abdominal pain, heavy bleeding, or severe nausea and vomiting that prevents keeping fluids down — contact your provider immediately.

Second Trimester (Weeks 14–27)

Many people find this trimester more comfortable. Nausea often improves or resolves, energy levels increase, and the risk of miscarriage drops significantly. You may start feeling fetal movement (quickening) around weeks 16–22 — this is often described as fluttering or bubbles. The anatomy scan ultrasound is usually performed between weeks 18–22.

• The anatomy scan (level 2 ultrasound) checks fetal anatomy, growth, amniotic fluid levels, and placental position. This is also when many parents learn the baby's sex if desired.
• Gestational diabetes screening is typically performed between weeks 24–28. You may be asked to drink a glucose solution and have blood drawn one hour later.
• Begin sleeping on your side (preferably left side) as the uterus grows. This optimizes blood flow to the placenta and baby.
• Stay active with moderate exercise: walking, swimming, prenatal yoga, and stationary cycling are excellent choices. Aim for at least 150 minutes per week.
• Monitor for signs of preterm labor: regular contractions, lower back pain, pelvic pressure, vaginal spotting, or fluid leakage. Contact your provider if you have concerns.

Third Trimester (Weeks 28–40+)

Your baby grows rapidly and gains weight during this trimester. You may experience more physical discomfort as your uterus expands: back pain, shortness of breath, heartburn, swelling in the feet and ankles, and difficulty sleeping. Prenatal visits become more frequent — every 2 weeks from weeks 28–36, then weekly from week 36 until delivery.

• Track fetal movement (kick counts) daily from around week 28. A healthy baby typically moves at least 10 times in 2 hours. If you notice a significant decrease in movement, contact your provider immediately.
• Attend prenatal classes to prepare for labor, delivery, breastfeeding, and newborn care. Many hospitals offer both in-person and virtual options.
• Pack your hospital bag by week 36. Include essentials for you (comfortable clothing, toiletries, phone charger, insurance documents) and the baby (clothing, diapers, car seat installed).
• Discuss your birth plan with your provider: pain management preferences, labor positions, who will be present, and preferences for interventions if needed.
• Know the signs of labor: regular contractions (5-1-1 pattern: every 5 minutes, lasting 1 minute, for 1 hour), water breaking (rupture of membranes), bloody show (mucus plug), and lower back pain or pressure.

Nutrition and Hydration Throughout Pregnancy

• Focus on nutrient-dense foods: lean proteins, whole grains, fruits, vegetables, legumes, nuts, seeds, and low-fat dairy. Key nutrients include folic acid, iron, calcium, vitamin D, and omega-3 fatty acids (DHA).
• Stay well hydrated — aim for 8–12 cups (2–3 liters) of fluid per day. Proper hydration supports increased blood volume, amniotic fluid, and digestion, and can help prevent constipation and urinary tract infections.
• Avoid foods that pose risks during pregnancy: raw or undercooked meats, unpasteurized dairy, raw eggs, high-mercury fish (shark, swordfish, king mackerel, tilefish), and deli meats unless heated to steaming.
• Continue taking your prenatal vitamin throughout the entire pregnancy. Iron requirements increase significantly in the second and third trimesters.

Sleep, Stress, and Emotional Well-Being

• Prioritize sleep — pregnancy insomnia is common due to hormonal changes, physical discomfort, and anxiety. Use pillows for support, sleep on your left side, and establish a calming bedtime routine.
• Manage stress through gentle activities: prenatal yoga, meditation, deep breathing, or talking with a supportive partner, friend, or counselor. High stress during pregnancy has been associated with adverse outcomes.
• Watch for signs of prenatal depression or anxiety: persistent sadness, excessive worry, loss of interest in activities, changes in appetite or sleep, or thoughts of harming yourself or the baby. These are medical conditions — speak with your provider.
• Build a support network. Connect with other expectant parents, join a prenatal class, and communicate openly with your partner, family, and friends about your needs.

When To See a Qualified Provider

Regular prenatal care is essential for monitoring your pregnancy and the baby's development. Contact your provider immediately if you experience: vaginal bleeding or spotting; severe or persistent abdominal pain; severe headache or vision changes (possible preeclampsia); sudden swelling of the face, hands, or feet; fever above 38°C (100.4°F); painful or burning urination; regular contractions before 37 weeks; decreased fetal movement; or fluid leakage (possible ruptured membranes). Your provider is your best resource for personalized guidance throughout your pregnancy journey.

Tracking Tips

Keep a pregnancy journal or use a pregnancy tracking app to record: your current week and day, symptoms and how they change, fetal movement patterns (kick counts from week 28), weight gain trajectory, blood pressure readings (if recommended by your provider), questions for your next prenatal visit, and milestones (first ultrasound, first felt movement, anatomy scan results). Tracking helps you stay informed and engaged in your care, and provides valuable information for your healthcare provider.

Take photos at regular intervals (weekly or monthly) to document your changing body. These visual records can help you and your provider track growth patterns and are a treasured keepsake of your pregnancy journey. Remember that every pregnancy is unique — focus on your own progress rather than comparing with others.

Common Myths About Pregnancy Weeks

Myth 1: Pregnancy is exactly 9 months from conception. In reality, pregnancy is measured as 40 weeks (280 days) from LMP, which is about 9 months and 1 week. From conception, a full-term pregnancy is about 38 weeks (266 days), or roughly 8 months and 3 weeks. The 9-month figure is an approximation.

Myth 2: You are not really pregnant in the first two weeks. While conception typically occurs around week 2 of gestational age, the 40-week count starts from LMP, so weeks 1–2 include the menstrual period and the follicular phase leading up to ovulation. This is the standard medical convention and is used for consistency in dating.

Myth 3: All babies are born at 40 weeks. Only about 5% of babies are born on their exact due date. A "term" pregnancy spans 37 to 42 weeks. Early term is 37–38 weeks, full term is 39–40 weeks, late term is 41 weeks, and postterm is 42 weeks and beyond.

Myth 4: You can tell the exact day you conceived from your LMP. LMP-based dating estimates the gestational age, not the exact conception date. Conception can occur anywhere from several days before to several days after the estimated ovulation date, depending on cycle length and timing of intercourse.

Myth 5: A due date that passes means something is wrong. Most first-time pregnancies go past 40 weeks, and it is normal to deliver up to 42 weeks. Your provider will monitor you and the baby closely and may discuss induction around 41 weeks if labor has not started naturally. Being "overdue" by a few days is rarely a cause for concern.