Last month, I went to a friend's house. I then went to use the restroom. There was no paper, so I used a little towel that I was going to dispose. I kind of cleaned my vagina very well, and even dipped the towel inside of my vagina a little. Now my period was supposed to come on the 14th. And it hasnt, now I'm a week late and im freaking out that maybe there was sperm/cum on the towel?? Could i be pregnant? I'm 18 and a virgin, but I'm scared that her brother used the little towel, even if it was really dry before I got it. I'm drinking vitamin c a lot and parsley but nothing seems to work