Help I’m scared

So recently I had protected sex but before he finished, he finished on my stomach. I accidentally got up but caught it before it went to that area and now I’m scared I could possibly be pregnant. I’ve been on birth control for more than 3 months and took plan b for a peace of mind, but I recently found out that the acne medication I’ve been taking, minocycline, decreases the effectiveness of both birth control and plan b!!!! Pretty much anything hormonal. Someone please give me advice. I’m not ready to have a kid 😣