Question: what are the chances of getting pregnant if you are on birth control and use a condom?
Answer: Condoms that fit into the vagina (called FC2 or internal condoms) are 79% effective — meaning 21 out of 100 people who use them as their only form of birth control get pregnant each year. Here are some things you can do to make condoms work even better: Use a condom every time you have sex.