I gave my girlfriend an oral sex,(Last week, Saturday) after that I wanted masturbate, so I touched my penis, it had pre-*** with either my right or left hand( but I think its right). Then I tried masturbating while standing, but I had a hard time so I just sat down and asked my gf to sit on me. (On my lap, no intercourse happened here) So I could just look at her, so while I was masturbating I was touching her vagina with my left hand then when I ejaculated, it landed on my belly. I avoided touching her already after that. Then I went to the sink but I couldn't turn the faucet since I don't want to hold it with a hand with semen. So she opened it for me but I think she touched my hand slightly. Anyway she said she didn't touch it anymore after that and washed the next day. (Since she was staying in a friend's house after.)
Anyway next week after that, (this week) she is suppose to have her period this week. But she doesn't have her period now. I was a bit paranoid and asked some questions that are symptoms of pregnancy. She said she is still energetic, she doesn't get that tired easily, yesterday, she had a bigger appetite. No signs of dizziness.She said she gained weight but it was like that before that happened. She thinks her breasts didn't change. Only thing is, she doesn't want to have a pregnancy test since she is only 15 and her parents knowing she is trying a pregnancy test. My girlfriend is still a virgin.
Well my questions are:
Should I worry about it?
Are there chances of her getting pregnant?
If there are chances, how big? Can you give me percentages?
Thanks :)