Reaching the third trimester you will feels like a relief. Your baby has developed enough at this point that he or she could survive if you go into labor early, and at least two-thirds of the pregnancy is behind you.
There’s some disagreement about when exactly the third trimester begins. Some people swear it starts at the beginning of the 26th or 27th week. Still others say it starts with week 29, but most experts say week 28 is the tipping point. At that point, you theoretically have exactly 12 weeks, or three months, left in a 40-week pregnancy. So it’s safe to say you’re in your third trimester once you hit the seven-month mark.