Help.. period & positive test results!

Took 3 tests.. all came back positive but started my period (cramping and all) last night before bed???? I’m 8 days late and so confused of what’s going on...? The first test was from yesterday, second was from last night and the third from this morning. I also was bleeding pretty bad when I was pregnant with my first a few days after I found out but it stopped after 8 hours.. I have no idea what’s going on.. any advice would help