women who don't have genital herpes should be careful about sex during the third trimester. unless you know for sure that your partner is herpes free you should avoid sex altogether during the third trimester. if your partner gets cold sores (oral herpes) he or she should not perform oral sex on you during this time. some doctors think all women should be tested for herpes when they get pregnant especially if their sex partners have herpes. ask your doctor if you or your partner should be tested.
how can i avoid getting herpes while i am pregnant?