Update

Long story short, I thought I was pregnant bc my period was 8 days late. 3 tests were negative. On the 8th day my period arrived but it was very light pink so I thought it was possibly implantation bleeding also bc I wasn't cramping. Then it got heavier later that day & had a bit of cramping so I figured it was just my period. It usually lasts 5 or 6 days. Today would be my 3rd day & this morning there was barely anything & I had no cramps. I went tanning & when I got to work about 20 minutes later I had really bad stomach pains that I could barely handle & they were a bit different than my normal period cramps & my period had gotten heavier again. Now no period, what is going on?