Unless you are experiencing pregnancy complications, it is safe to continue having an active sex life until your water breaks or you are in labor. Sexual activity does not cause miscarriage and will not hurt your baby. The baby is kept safe by the amniotic sac, cervix, and uterine muscle. There is also a thick mucous plug that seals the cervix and protects the baby from infection.
You may need to abstain from some or all sexual activity if you have symptoms of preterm labor; vaginal bleeding; leakage of amniotic fluid; placenta previa (when the placenta is covering the cervix); or what is called "incompetent cervix," a condition in which the cervix is weakened and dilates (opens) prematurely, raising the risk for miscarriage or premature delivery.
If you are experiencing these pregnancy complications, your health care provider will advise you to stop having sex. Be sure to talk openly with your provider about why, and what specifically she or he recommends that you stop doing. If you have preterm labor, you will want to avoid uterine contractions; therefore, nipple stimulation and orgasms are not a good idea. With other conditions, these sexual activities are fine? original , but you should avoid vaginal penetration.