Weird spotting?

So long story short, we had sex the week of ovulation. So of course I’m paying attention to every little thing. I’m supposed to start my period Sunday. So last Thursday i went to the bathroom and wiped and saw pinkish brown discharge. Had the same discharge Saturday and today was more. Am i starting my period early or what? I’m having cramps and back pain, and awful headaches. Randomly hot, dizzy and nauseous.