I had unprotected sex for the first time however, and i went ahead and got myself a plan b pill within 24 hours, is it likely that i get pregant?

Earlier the better: The immediate use of an emergency contraceptive can reduce the risk of pregnancy to 1 to 2%. The effectiveness depends on the regimen and the timing. Plan b is quite effective and can be taken up to 72 hrs after unprotected sex - the earlier the better, though. Your period make be later than usual because you used Plan B but be sure to take a pregnancy test if it is more than 2 wks late.

Unlikely: Plan B taken within 72 hours of exposure works 99% of the time.