So so so confused

Dr prescribed birth control which was all cool ,

Stopped taking it 2days before my last 2 pink tablets ,

Ovulated (yay)

We bd'ed a little before stopping it and a lot after...

I bled at 7Dpo

Tested at 9dpo neg

10 dpo neg

12 dpo neg

13dpi neg

14 dpo faint positive but clear(Period was due)

15 dpo negative!On a clear blue plus?!?!?What???Im so lost right now ladies :( any advice?