After sex, there are a few important things to do in order to prevent pregnancy. The most effective way to avoid an unwanted pregnancy is by using contraception such as condoms or birth control pills. It is also important to take emergency contraceptive pills if you had unprotected sex or the condom broke during intercourse. Additionally, it is important for both partners to get tested for sexually transmitted infections (STIs) and be honest about their sexual history with each other in order to protect themselves from getting infected with something that could cause infertility or other health issues later down the line. Lastly, it’s always wise for women who want to reduce their chances of getting pregnant after having unprotected sex –especially if they have already ovulated–to take progesterone supplements which can help inhibit ovulation until the next menstrual cycle begins.