How Many Weeks Pregnant Am I?
Enter the first day of your last period to see exactly how many weeks and days pregnant you are right now.
How Pregnancy Weeks Are Counted
Pregnancy is counted from the first day of your last menstrual period (LMP), not from conception. This means you are already "2 weeks pregnant" at conception. A full-term pregnancy is 40 weeks (280 days) from LMP. Your doctor uses this dating system because LMP is a known date, while the exact conception date is usually uncertain. If your dates differ from an early ultrasound by more than 7 days, your provider may adjust your due date.
Week-by-Week Development
Weeks 1-4: Fertilization and implantation. Weeks 5-8: Heart begins beating, brain and spinal cord forming. Weeks 9-12: All major organs present, fingers and toes form. Weeks 13-16: Gender can be determined, baby starts moving. Weeks 17-20: You feel kicks (quickening), anatomy scan. Weeks 21-24: Baby gains weight rapidly, viability milestone. Weeks 25-28: Eyes open, lungs developing. Weeks 29-36: Brain develops rapidly, baby turns head-down. Weeks 37-40: Full term — baby is ready for birth.
How many weeks pregnant calculator gets 100K+ monthly searches. Users return weekly to check their progress, creating excellent repeat visitor rates. This page naturally cross-links to due date, weight gain, and baby milestone calculators — driving strong session depth.
