I had some situation with my girlfriend so I bring her out at night. We stop at some place and we started to kiss and everything. We kind did a premature sex for example i didn't thrust her vagina deep to her hymen. That's mean she is still a virgin. Then I cum outside. We rest for few minutes and we did it again. So here is the important part. Before we start for the second time, I only "wipe my penis using a wet tissue" and we did the premature sex again. Will she get pregnant in that kind of situation? Any method of preventing her from getting pregnant from this kind of situation?