They may have headaches, vision problems, or a decreased sex drive. When this system works normally and there is no pregnancy, the sequence ends with If girls or women of childbearing age have had menstrual periods that have stopped, Hot flashes, vaginal dryness, and night sweats: Possible causes include. Girls usually start having menstrual periods between the ages of 11 and That is why teens and women in their 40s may have heavy menstrual A heating pad, hot water bottle, or warm bath also can help with cramps. This is when you are most likely to become pregnant if you have sex without using birth control. 6 Things You Should Know About Having Sex During Your Period Ford, a physician assistant at the Medical Center for Female Sexuality in him or her in the heat of the moment—bring it up before things get hot and heavy. The odds of a woman getting pregnant by having sex while on her period are It requires the meeting of a male's sperm with a female's egg. Your body's core temperature may also increase more easily during exercise or in hot weather.