Implantation or period?!

I've taken 3 tests one negative and two show up faintly and than 4 or 5 minutes later disappear. All before the 10 minute mark. I started cramping today and it was uncomfortable than began bleeding. It wasn't as heavy as my period but still not light. Than a few hours later only spotting lightly when I wiped now back to this. Smaller spot is when I wiped. The larger I had to dig a little. (If you know what I mean) I am SO terribly confused! Someone Please Help! My symptoms that I've experienced are

light headed ness

SENSITIVE Nipples

headaches

bachaches and mild lower abdominal cramps