Help please

I just had sex for the first time with my boyfriend and we didn’t use condoms. I know it’s very irresponsible of us but we pulled out about a minute or two before he was about to cum and everything was fine. Until now, (few hours after) I’m feeling sick and stressed about the fact that I may be pregnant. Everything comes to a negative outcome (in terms of me being pregnant) but I’m just having these negative thoughts. What if. What if. What if. I don’t want to tell anyone. My friend is trying to sort me out with a pill and I’m hoping it works. However I feel so bad about everything. I let myself down. I’m still in school and i don’t know how my parents are going to react if it turns out I am and I dont know how I’m going to cope. Someone give me some advice, I beg :(((