Your body is bound to go through more than a few changes during pregnancy. Your waist will expand, you may recognize a pregnancy "glow," and things will swell that should never, ever swell. The internal changes, however, are arguably more drastic. As a fetus grows and changes, a pregnant person's body learns to accommodate. Sometimes you can see and/or feel the results of that accommodation, i.e. morning sickness, heartburn, and constipation. Then there are the ways your cervix changes during pregnancy that might be a tad more subtle, but, nevertheless, just as important. The human body, my friends, is truly a fascinating thing.
Today's Parent describes the cervix as "the narrow neck of the uterus — picture the opening at the bottom of a balloon." The site goes on to explain that the cervix is the part that keeps theuterus closed until you're ready to deliver, preventing anything from getting up into the uterus and/or fallopian tubes. In other words, your cervix acts like a door that keeps your uterus safe and healthy. While your cervix allows for a very small opening — which allows menstrual blood and/or sperm to pass into and/or out of the uterus — the cervix experiences numerous changes throughout the 40 weeks, more or less, of a pregnancy.
When the aforementioned changes occur you'll likely experience the occasional spotting, particularly after sex, because the cervix consists of connective tissue and muscle. So while you can't see your cervix change during pregnancy, sometimes you can see the impact those changes have on your body. So with that in mind, here's what happens to your cervix as you grow another human being inside your very own body: