So on Saturday I was on my 5th day of my period...and I had sex while on my period also and I was doing fine but when I woke up and put in a tampon on my 7th day and when I went to the bathroom I found this stuff? And today I found it again? I haven't did it since earlier? But I'm still curious.... by the way, I'm on birth control and we used a condom... my friend said it was old blood and discharge? What is this? please be nice...I'm worried.