Depot Lupron

Is it normal to have had sex 3 days ago meaning Thursday and now I’m cramping and I think spotting is it possible I could be pregnant. I’m on lupron depot and I’m not supposed to be able to get my period meaning i don’t ovulate but my dr said it’s possible to get pregnant. Also wasn’t taking my birth control for 2 weeks from when I was puking cause it didn’t do me much good.