PLAN B PILL AFTERMATH!

So me & my boyfriend do the pull out method all the time. But twice in the last month he’s finished in me & I taken plan b both times a couple hours later. So this morning I was having some light cramps and I go to the restroom and I think I got my period 2 entire weeks early. It doesn’t feel like a normal period at all. I think it’s because I took plan b. But I just need to know what are yalls experience with plan b, and if there’s even a chance I could be pregnant.