How do weeks of pregnancy correspond to months

Because few women know the exact day they ovulated or conceived, an ultrasound done in the first trimester of pregnancy has been shown to the be the most accurate way to date a pregnancy. If an ultrasound date in the first trimester differs from your LMP date by seven days or more, we would go with the ultrasound. That measurement should match your gestational age in centimeters. If you are measuring smaller or larger than what you should be, then the doctor might order an ultrasound.

If the baby is actually smaller or larger than what they should be, underlying issues need to be considered that might be causing the discrepancy in growth. For example, mothers with uncontrolled diabetes Type 1, Type 2, or Gestational cook very large babies.

These discrepancies might affect delivery, but they might not. For example, if your baby is consistently measuring small and falling below where they should be, your doctor might decide you need to be delivered because your baby would be better out than in.

It is for educational purposes only and is not intended to replace the advice of your doctor or other health care provider. We encourage you to discuss any questions or concerns you may have with your provider. First Trimester 0 to 13 Weeks The first trimester is the most crucial to your baby's development. Second Trimester 14 to 26 Weeks The second trimester of pregnancy is often called the "golden period" because many of the unpleasant effects of early pregnancy disappear.

Somewhere between 16 weeks and 20 weeks, you may feel your baby's first fluttering movements. For women who ovulate on day 14 of the menstrual cycle, day 1 of pregnancy will correspond with day 1 of the last menstrual period LMP.

Pregnancy can be broken down into days, weeks, months and trimesters. Day 1 marks the beginning of week 1 of pregnancy, month 1 of pregnancy, and the start of the first trimester.

A baby is conceived during week 3 of pregnancy. Day 15 marks the beginning of the week 3. The average pregnancy is days long. Another way to talk about the days and weeks of pregnancy is to combine the two units of measurement. Week 1 of pregnancy begins on 0 weeks 1 day and ends on 1 week 0 days of pregnancy. Week 2 of pregnancy encompasses the time between 1 week 1 day and 2 weeks 0 days of pregnancy.