Implantation?

Marissa

Hi everyone I'm very confused and I was wondering if anyone could help with some answers. According to my app I was supposed to get my period on the 4th.and I am never ever late but this month instead of getting my period on the 4th I didn't start bleeding until the 6tb after my husband and I had sex. I thought I had gotten my period then but the bleeding only lasted for like a day and a half and all together it was like less than a tablespoon..it was very spotty and very light pink. I have taken 3 pregnancy tests since then and they all say negative. I'm wondering could this be implantation. On top of the very light bleeding I had no other regular symptoms of my period no cramps.bloating.or soar breasts. Please help..I want to be Prego so bad lol