Have I ovulated? Unexplained bleeding!

[Ljj12355]

I was having a follicle tracked that was 21mm at the last scan (16days ago). A couple of days later it had disappeared which my clinic told me meant that I had ovulated. My lining was 9mm and my 7dpo progesterone bloods were 54 which further confirmed ovulation. 8dpo (day after bloods) I started bleeding really heavily with clots for 24hrs. Since then I've had no bleeding. Tomorrow will be 14dpo & I haven't done a HPT due to the bleeding, which my clinic was at a loss to explain. Any ideas what this bleeding could have been?? My clinic said there was no way I should have been able to bleed (but I did). What could this be???

[naty1]

Bit confusing. How do you know it didnt ovulate the next 24 hrs after scan so youre 15 dpo. So it would be understandably a period starting except only for 24hrs.
Could have been a cp?