Not on bc but took plan b, should I be worried?

H

I’m not on any birth control since I haven’t been with anyone in a long time and didn’t have plans to be sexually active recently. In a surprising turn of events, I had sex with someone 3 days ago but while we were having sex, the condom slipped off and was inside me. We continued to be intimate (with condoms) after the incident and as a precaution, l took plan B the next morning (less than 24 hours later).

Should I be worried that plan b and the condoms won’t be as effective in preventing pregnancy because I’m not on birth control? I don’t think I’m ovulating at the moment but my period hasn’t come yet this month. Ty in advance for any advice.