The 1st trimester lasts from the moment of conception and up to 13 weeks. This is an important and crucial stage of pregnancy when a new life is conceived, and the tissues and organs of the future child are formed. At the end of the first trimester, your baby is already called a fetus and looks like a little human. From weeks 3—4, some women begin to feel the changes caused by hormones that prepare your body for the development and nurturing of a new life. As soon as you assume you are pregnant, schedule your first appointment with the doctor. Usually, it occurs at weeks 7—9.
You may not look pregnant yet — but chances are you're feeling it. That's because a flood of pregnancy hormones is prepping your body to play baby hostess for the next nine months — so you could be in line for quite a few aches and pains, from fatigue to flatulence. While you might be less than thrilled with some of these symptoms, try to remind yourself that these temporary discomforts are part of the incredible process that's happening inside: You're growing a child! The first trimester lasts from week 1 through the end of week 13 of pregnancy. Not sure what week you are in your pregnancy? The first step to nailing your current week down is to calculate your due date.
A pregnancy lasts for about 40 weeks. The weeks are grouped into three trimesters. The first trimester is the time in between fertilization of the egg by the sperm conception and week 12 of a pregnancy.