Strange Period

Frances

So last week during the week wait after ovulation I swore I was pregnant, I felt nauseous, weeing alot and was stab strange feelings in my stomach. Whole I'm not unfortunately as I got my period on Monday. This is now my second period after a blighted ovum in March. However this one came back with a vengeance. The cramps and bleeding has been horrendous and I have been feeling weird movements in my stomach. I am wondering if this could be a sign of endometriosis or PCOS or just because of my miscarriage in May. Has anyone else experienced weird symptoms like this before and during their period?