Days To Get Pregnant Dear BeingGirl Experts, I have recently started having sex with my boyfriend, and I'm wondering when I am most fertile so that I don't get pregnant. Please let me know. Makenzie --- Dear Makenzie, You are most fertile 14 days BEFORE the onset of your next menstrual period. You can get pregnant if you have intercourse a day or two before you ovulate, the day you ovulate, and a day after you ovulate. Using this information to try to avoid pregnancy is called the "rhythm method." But it's a VERY unreliable method. So, if you are sexually active and do not want to become pregnant, talk to your doctor/healthcare professional about birth control as well as how to protect yourself from sexually-transmitted diseases. When you are sexually active you need to plan a visit with your gynecologist/healthcare provider. This is important to protect yourself from infection and pregnancy. Take care of yourself, Your BeingGirl Experts Questions about the days to get pregnant? Get helpful answers from the BeingGirl expert.