miscarriage before BFP

I woke up this morning to a practical murder scene. bled through underwear sheet and mattress pad. went to the bathroom and 2 large clots came out.

AF I'd not due until Friday, so I haven't taken a test yet. last month I had a normal period and three BFNs. I stopped the pill at the end of November to begin TTC #1.

basically, is this a miscarriage? I'm going to call my gyn in the morning and try to get in to see her. could it be my hormones still regulating? I've gotten postive OPKs both cycles.

thanks in advance