Brown discharge

So I’m on the pill and today Is the third day into my placebo pills. I had sex two weeks ago but nothing happened. I’ve usually started by now. I’m probably just paranoid but I don’t know for sure. I’m having cramps like I do every month. I had a mild headache today. I feel normal or like I would when I start my period but there is just a light brown discharge, but when I wipe it’s slightly pink. Typically I’m a regular flow and on time. Opinions?