Most women will begin experiencing Braxton Hicks contractions around the 5 th -7 th month and will continue until delivery. These contractions can be described as a tightening of the abdominal area, but are usually not painful. These contractions can also be felt after having an orgasm. After an orgasm you may experience stronger Braxton Hicks contractions and you may experience some cramping. This is perfectly normal.
Many women say that their abdomen gets very hard after an orgasm.
During the fourth and fifth month, you may notice your uterus knotting up in a little ball after an orgasm which is very normal. When ligaments stretch, especially in first-time pregnancies, it can cause a burning, pulling sensation on the sides of the abdomen. I have heard of women who have a lot of pain with the ligaments stretching. If your contractions are painful and you are near the 40 th week of your pregnancy, you may be experiencing true contractions. Braxton Hicks contractions do not dilate or efface the cervix.