At 13 weeks pregnant you are in the first trimester, with about 27 weeks to go until a 40-week due date. Weeks are counted from the first day of your last period, so this is roughly month 3 of pregnancy.
How big is your baby at 13 weeks?
Around week 13, your baby is often compared to a peach. Fruit and vegetable comparisons are a friendly way to picture the size, not an exact measurement.
The first trimester runs to the end of week 13. It is when the baby's main organs and body systems start to form, and many people feel tired, queasy or both.
Your body at 13 weeks
Energy often returns and appetite improves. A small bump may begin to show, especially if this is not your first baby.
What is going on
The second trimester begins. Your appetite and energy often return as hormone swings settle. Round ligaments that hold the womb have started to stretch.
What can help
Use this window to build a light exercise habit, such as walking or prenatal yoga, if your doctor allows it.
Other weeks
11 weeks pregnant · 12 weeks pregnant · 14 weeks pregnant · 15 weeks pregnant
See all weeks on the pregnancy week by week page, or try the interactive week-by-week guide.