Implantation bleeding ??

Breanna

Ok so me and my fiancé tried conceiving all last month and I got my period aug 22 , this month (2weeks after my period) we had unprotected sex and then I’m started to bleed (browish/redish) slight cramps on lower left back 3 days after ? Implantation bleeding maybe ? Or is it still early ? Anyone had this happen and turn out pregnant? Thoughts?