friends with benefits

Sooo I've been seeing this guy for a few weeks , and he's aware it's just a fling, no strings attached because I'm moving away soon , so tonight we watched a movie and then moved to the bedroom, I guess we just got so into it we didn't use a condom , and he came in me, I'm a little nervous because I'm not on birth control or anything . So I'm just curious on opinions on what I should do ... <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> calander said I'm in my fertle window and at a 22% chance of getting pregnant 🙈