My girlfriend and I were messing around and she had her hand around my penis. Later, I put my hand around her hand that was around my penis. I know that I precumed, but I am almost postive I did not get it on my finger. If i did, it was not wet. Later, I rubbed the top of her clitorus, and just barely touched the actually vagina. This happened on a Sunday, and her period ended 3 days ago, on Thursday. Her period started on Monday. Is there a pregnancy risk?