If you fall into one of the above risk categories, be sure to ask your doctor or midwife to clarify the length of time that intercourse should be restricted and any other specifics, such as avoiding orgasm. And always call your practitioner if you experience a discharge of bright-red blood after sex (especially if it's accompanied by fever), or any leaking fluid.
You may feel your uterus contract or increased fetal activity after orgasm. In fact, uterine contractions can last for up to 30 minutes after intercourse for some women. These contractions and movements are perfectly normal and you don't need to worry about them affecting the baby.
Due to increased blood volume and engorgement, your cervix may bleed slightly after sex during pregnancy. So don't worry if you see a bit of blood, particularly in the last trimester.
As long as your pregnancy has progressed normally, you should still be able to have sex in your last months, provided you're not carrying multiples. Despite all the myths, no link has been established between preterm labor and sex in the last trimester. Lying flat on your back at this late stage in pregnancy, though, is not a good idea. Talk to your doctor or midwife about positions that are still safe.
Finally, once your water breaks you should not engage in intercourse or insert anything into the vagina, as this could cause infection.
Source: American College of Obstetricians and Gynecologists
All content here, including advice from doctors and other health professionals, should be considered as opinion only. Always seek the direct advice of your own doctor in connection with any questions or issues you may have regarding your won health or the health of others.