HELP...!!!Brown Discharge and diarrhea

Ok ladies I need help I have no idea what is wrong with me...I was supposed to get my period last Saturday (keep in mind I am irregular) so Really just any time last week or this past week we just had but instead of my period I’ve just been having this light brownish pink discharge and having diarrhea I’ve been having the brown Discharge for about 3 or 4 days and the diarrhea for 2 days...I have been having so light pelvic pains and headaches but otherwise that’s it...has anyone experienced this before and knows what this is...