EBF & pregnant at 8 weeks pp?

I am currently 8 weeks and 2 days postpartum & think I might be pregnant. 😳😳 At 6 weeks postpartum, and the day after, I had unprotected sex (not even the pull out method). I started the mini pill at 6 weeks & 4 days. The last couple of days I have been very crampy & light headed. I am also EBF. I know it is very unlikely but is it possible??