Ladies need answers

So I been having unprotected sex all month even when eve and glow said I was ovulating ( yes I am try to get pregnant)

But this morning I was spotting but it was really light so before I went to work I put on a pad when I came home nothing was on the pad

Hours later decided to use the bathroom I wiped myself and just seen brown stuff it’s very light tho

My question is when does implantation bleed occur ? How would I know if it’s implantation bleeding or my period?

Would you think it’s just my period ?