Miscarriage or late period?

Ash
So my last period was around 20 days ago, I was on the 42nd day of my cycle before the bleeding started. According to this app my period wasn't suppose to start till the 12th but it's come early (I hope) and it's day 3 in. I've not been this late before and this period (if that's what it is) is different from all my others. Usually I get back pain, stomach ache and it starts off heavy, generally by day 3 it's slowed down. But this time it started off really light, I thought I was spotting but now it's really come down and I've noticed some clots and my lower abdomen is aching as well as my back. I had two negative HPTs but I felt signs like nausea and headaches until today. The headaches are gone and I feel fine, only my abdomen is cramping. Sorry if this is really long but in really confused and I don't know what to do. Could this just be a normal late period or could it be that I was pregnant without knowing. I think I would have been 2-4 weeks if I was, I had 2 glasses of Ricadonna (wine) on Sunday and I feel really guilty. Please help. 

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