After having dry sex with my boyfriend, I noticed it was very painful down there when I got home. I went to the bathroom and found a small amount of blood for some reason. Could it have been my period or something else. But the blood didn't flow or lasted a week long like a regular period would, it lasted for like 10 seconds, so i assumed it was something else. Could it have really been my period? It's been around a month already but my period still hasn't come either and I'm super worried and paranoid about this. Please help