ipill

I took an ipill three weeks ago and had my false period two weeks ago. according to one app i have already had ovulation and according to this one im due to have it this week. i’m so confused when my period will come, it’s scaring me a lot. but i had taken the ipill 1.5 weeks before my due ovulation. i should be okay right? how much of a delay can i experience in my upcoming period can someone please help me out here if you have gone through this with ipill or plan b? :( im a really anxious college kid please!!