I need help...

Me and my boyfriend were intimate on the 22nd and 23rd. I was supposed to start my period the 23rd but didn't and I still haven't gotten it. BUT I noticed earlier today some brownish discoloration to my discharge and it eventually mixed with some pink along with mild cramps. It stops and then it'll come back but very little at a time. Is it implantation bleeding or is this just an unusual sign of starting my period...

ANDDDD no one wants to help me...so this was a pointless post