Early Bleeding

Hi ladies!

Today I’ve been having some mild cramping and when I went to the bathroom and I wiped there was some light brown blood on the tp. I take birth control ( I believe it is LarinFe) and I am not supposed to get my period until the 13th, a week from today. I last time I had sex was on Nov. 25 (sorry if that’s tmi) and we used a condom in addition to me taking birth control but I am concerned about this bleeding (could it be implantation bleeding?) and was wondering if anyone may have some input? Thank you in advance :)