Yes, a girl can get pregnant during her period. This might happen when:. Menstrual cups are made of plastic or rubber. Human reproduction, 17 5 One of your ovaries then releases an egg. Others get headaches or feel dizzy. Hormones cause the lining of the uterus to become thicker with extra blood and tissue. Brigid Godfrey, teen writer Reviewed By: Completed several internships in the European Union. You can keep a tampon or menstrual cup in and play as per usual with the vulva. Talk to your doctor about the best type of birth control for you. Hormones cause the lining of the uterus to become thicker with extra blood and tissue. The truth about sex and pregnancy is that the best way to protect yourself from teen pregnancy and unwanted STIs is abstinence. Running a red light, riding the crimson river, going with the flow or making a crime scene - period sex has a lot of nicknames and even more misconceptions surrounding it. A thinner, shorter version of a pad is a "panty liner. You can get pregnant in any kind of water — bath, hot tub, etc. Timing of sexual intercourse in relation to ovulation—effects on the probability of conception, survival of the pregnancy, and sex of the baby.