Implantation bleeding?

I started to get crampy last Saturday and was all week. Thursday I started with very light spotting. I took a test Friday and it was negative. Friday I started bleeding. I have been using a tampon but it's not very heavy. My period is due tomorrow. I'm wondering if this is implantation bleeding? Idk....I am really hoping so! My period is never early. I'm not really crampy anymore. Thoughts??