How is pregnancy weeks counted?

Pregnancy is counted from the first day of your last menstrual period (LMP), not from conception. This is approximately 2 weeks before conception, so you're technically 4 weeks when you get a positive test.

How many weeks is a full pregnancy?

A full-term pregnancy is 39–40 weeks. Delivery before 37 weeks is considered preterm. Delivery after 42 weeks is considered overdue.

What are the three trimesters?

First: weeks 1–12 (morning sickness, organ formation). Second: weeks 13–26 (energy returns, quickening). Third: weeks 27–40 (weight gain, readiness for birth).

How is pregnancy weeks counted?

From first day of last menstrual period (LMP), not from conception. You're ~4 weeks when you get a positive test.

How many weeks is a full pregnancy?

39–40 weeks is full-term. Before 37 weeks is preterm. After 42 weeks is overdue.

What are the three trimesters?

First: weeks 1–12. Second: weeks 13–26. Third: weeks 27–40.

How accurate is my due date?

Due dates are estimated. Only ~5% of babies arrive on their exact due date. Variation of ±2 weeks is normal.

Can pregnancy last longer than 40 weeks?

Yes, but after 42 weeks the risk of complications increases and labor is typically induced. Exact dating from early ultrasound helps determine true due date.