Help?? Can I get pregnant after withdrawal bleeding?

Hi, 

I had two periods in my 28 day cycle because I took plan b. I bled for several days, and had unprotected sex days after my second period. I was wanting to know if this will mess with my usual ovulation that should've occurred after my first period. Is it possible for me to still get pregnant?? I checked my ovulation calendar, and if I were to go off my second period, I am most definitely fertile right now. I just would like to know if there is a possibility of that??