First time sex

Hey guys, so I'm new to this app, but I hope you can help answer something for me. I'm 17 and a little over a week ago my ex-boyfriend and I had sex in my pool, I didn't expect it to happen, we were just making out and then he took my bikini bottom off, but anyways I'm not on the pill and we didn't use a condom. I was ovulating at the time but he said he pulled out so I couldn't be pregnant. I'm still worried though so I went to my OB-GYN and she said I shouldn't worry about it, and that it was too soon to tell if I was pregnant or not so I should take an at home test in a week. I'm really nervous and feel tired and bloated and stuff, but could that just be related to stress or something? I'm really nervous, I can't have a baby, my parents would kill me, so I just wanted to know if my worrying is justified or not. If anyone has an experience or knowledge please comment, thanks!