This is getting a little weird

We’ve been TTC since July. Got pregnant in the first cycle, miscarried at 8weeks. My cycle was a little haywire for the rest of the fall. For the last three months, however, I’ve started bleeding about 10 days before my period is supposed to start. I tell myself it might be implantation bleeding, but then it turns into an entire period! It’s happened every month for 3 months. It’s getting frustrating, not to mention difficult to predict ovulation. What is going on? Has my body just decided its going to have a period a few days after it ovulates? Has anyone heard of this? I obviously need to see my OBGYN, but I thought I might get some insight from you as well. Any ideas ladies?