Hello ladies

I could really use your help here because I'm at a loss. You would think after 4 pregnancies I'd know by now but I don't 😔

So I'm not sure what's going on this month but it's been weird. I've had pregnancy symptoms (exhausted, cramping, back pain, sore boobs, moody, nausea, ect) and a late period by 3 days which is alittle strange. Negative dollar store test the day of missed period. Early Friday morning like 1am I went to bathroom and wiped and there was a small amount of pink discharge. I thought okay cool I'm getting my period and put a pad on. Cramping and lots of back pain but Nothing again until later in the day. Enough to fill 1 1/2 tampons for 12 hours. Cramping kept on from around 11am yesterday though last night. Now it's alittle heavier but not by much and I passed this tissue. Was i pregnant and didn't know or is it uterine lining?