Is my girlfriend pregnant? Please help *URGENT*?

Me and my girlfriend were messing around and I put my penis in her vagina, not even all the way as we couldnt (Didnt fit too tight) Then took bak out, presuming I had precum on the head. She missed her period but this was before we did this which makes me think that she cant be. She had one drop of blood on the 7th and 8th, and nothing on the 9th. On the 9th in the evening is when we did this, so she missed it before we tried anything, its been only one week and she told me she threw up abit and felt a little dizzy. PLEASE Answer, only 14! Thank You