Pregnant or Not

Erica

I had sex December 2 he pulled out but the Dec 1 I had took a plan b . Now I started bleeding Friday heavy as if I had got my period and it stayed like that for 2 days now it’s all light brown and red but it’s not a lot anymore . I took 2 pregnancy test and one was negative and the other seemed to have a faint line but it could just be a evap line . I will test again inn2 days but is it possible that I could be pregnant?