So I was supposed to start my period on the 10th, but I didn't and I had intercourse on the 12th (two days later) and it caused a little bleeding but it stopped within 10 minutes. I thought I was going to start my period but I haven't and I haven't even needed a pad or a tampon and when I wipe there is a little bit of pink/brownish discharge on the toilet paper. Could I be pregnant? I'm a little irritable lately and all I want to do is cry, which is totally unlike me. I'm a very happy person.

I'm 24 and I've never been pregnant. Do you think I could be and when could I take a test to know for sure?

Thanks!