Stupid question but...?

This may be a stupid, dumbass question but can you get pregnant if a guy comes on your back? I am just finishing my period and going into ovulation (didn’t really think about it until now) and I’m assuming this is the most fertile time to get pregnant (which I am trying to avoid). I don’t think any traveled into my areas as I wiped and cleaned off pretty well and I took my first pill of the month (of birth control) tonight. Am I being paranoid?