my s/o and I had sex the other day and afterward I had some blackish brown discharge with a light red after. I figured I was starting my period so I used a tampon and went about my business. a few hours later I check/change the tampon and there was barely anything there! the lightest amount of red and blackish brown. well I discontinued the tampon and have had nothing but clear discharge since! I am about 10 days past ovulation if that helps! Also, my period usually starts a few days earlier than what glow suggests and there's nothing yet. Any help?