Implantation or early period?

Savahanna

I stopped my period on the second and and about a week ago I had sex and after I noticed I was bleeding(more so spotting). I wasn’t before and I wasn’t the next morning. Now(a week later) I’m on day two of spotting again. It’s not enough for a tampon not even a pad. I’m not due for my period until next week. I took a test and it came back negative. Does anyone have any idea what this could be????