Implantation bleeding?

Elisa

I’m so scared. My boyfriend and I had unprotected sex about a week and a half ago (dumb, I know). Tonight, I went to the bathroom to pee and when I stood up I saw bit of pink drops in the toilet. My underwear also is slightly pink/watery. I’m so regular. Never missed a period or been early. I’m not supposed to start my period for another week. Could this be implantation bleeding?