Implantation bleeding or just late period?

Ok so I had sex 4 times this month with one time being multiple session. The 16th was supposed to be the day I get my period but I didn't. Right now it's two days late. BUT yesterday I had a bit of brown discharge and also red colored bloody discharge. I had to wipe two times to get it all clean but it wasn't like a period. I'm freaking out here :/ I don't know what it is and I've been having stomach pains/cramps and lots of bowel movements . I haven't had any other signs that I might get my period and I'm worried. My cycle is 27-28 days and it's never been as late as it has now...30 days and nothing. Only spotting on the 29th day of my cycle. What could this be?? I "ovulated" the 5th and had the bleeding/spotting 14 days later. What do you think? Am I just freaking out? Should I wait longer?

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