I think it's all in my head

I want a baby so bad and I wasn't sure if my husband was ready so he asked me to take a plan B pill and I did 
But like 4 days and a couple slip ups later I started bleeding. I had only been off AF for like 10 days 
It wasnt normal period blood though which for me is really really heavy 
It started brown and it wasn't spotting per say but it was extremely light and only lasted a few days
Since then I've been really really tired and can't seem to get enough to eat. Could I be pregnant even after the pill??