I have a very regular menstral cycle but this month I was 3 days late. The week prior to being late I was having alot of abdominal cramps and nausea which I've never had prior to having my cycle. On day 1 of being late, no spotting, on day 2 of being late, spotting, nausea, and more cramping, on day 3 of being late sever cramping, nausea, and heaving bleeding with clots. I didn't take a ept after my cycle was late. When calculating when conception might occurred, my husband and I had sex. Could I be miscarriaging?