So my bf and I were fooling around one night. We always always wear condoms when having sex. However, I let him go in bare for a few seconds before we really began having sex full on. I was scheduled to start my period in about 4 days anyway so I wasn't ovulating and I figured it would be fine. Im aware precum can possibly have semen in it but I have read very conflicting research on the topic. I'm still having achy period symptoms like before my bf went in and I'm scheduled to start my period in a day or 2. But me being my anxious self can't stop wondering about it here and there. Is there any possibility I could get pregnant from that?

I am almost certain I am not pregnant. However it would give me peace of mind to hear some opinions on the matter.

Thank you all in advance!