I started my period either the 4th or 5th but i know on the 5th I began bleeding like i normally do. I tend to have irregular and heavy periods but my bf and I had unprotected sex oct 9th. right when my bleeding started turning brown/ light red/pink.

Since I'm sick I don't want to mix plan b with antibiotics and by the time I'm better I'd miss the window. The app predicts preovulation to start the 12 (fertile window ?) and even though my bf didn't finish I know precum is still a risk given sperm lives for up to 5 days. What are the chances I fall pregnant?

-Has anyone gone through the same or experience something similar?

I'm currently 23 and know it was very irresponsible given I'm not trying to conceive but if i were to end up my bf and I would step up