Has anyone experienced this before?

We have been TTC for over 2yrs now. We are on our first round of Femara. I ovulated on July 20th. I got my first positive pregnancy test at 7 DPO (7/27). It was a very faint line so I took several more to verify. I got a clear positive at 12 DPO (8/1). I took 4 more pregnancy test and they were all positive. The last one's on 15 (8/4) and 17 DPO (8/6) were strong positives. Yesterday (8/9) I woke up to super heavy bleeding (red with blood clots) and heavy cramping. It feels like a heavy period.

Update: Chemical pregnancy confirmed