Help!

I had unprotected sex earlier this month while ovulating but took a plan b less than 24 hours later. I had protected sex yesterday with no come but the precum may have gotten on me from his hands when he was removing the condom and touched me after but am not entirely sure. I took a pregnancy test it was negative but that doesn’t ensure I can’t be pregnant from this last time. Should I take another plan b my only hesitation is the fertility when I’m older with that and the expense. Thoughts??? My period is scheduled for tom