Could i be??

So i just started BC (birth control) and my doc said 2 weeks safe sex. Well we did that. I had this other app that told me i was a 7 that day. Witch means 70% chance. Well he had accidentally cumed inside that that day. Now my period is late. But its also not always been normal. Am i just crazy? Is my BC affecting my period? (Was told could be it) or are we having a child?!?!?!