Pregnancy Risk After External Sperm Contact: Probability & Prevention

Question
dear,
I had sex with my girlfriend during last 5 days, 3 times each day, her last menstrual bleeding started 26 days ago, I ejaculated between her legs and on her vulva, but not inside, she is still virgin, but i read that it is still possible that she get pregnant,can you please tell me how much is the possibility for her to get pregnant? what should I do to prevent this? is there any chemical or herbal drug easily available to prevent this? we really dont want her to get pregnant, it will totally disrupt our life, please help us,
thank you very much

Answer
It is possible for her to get pregnant with the method you are describing. I can't tell you the chances of that though over the internet. I would strongly advise you to refrain from sexual relations. That is the only way to guarantee 100% that you will not cause pregnancy. Do you have a pregnancy center there where you can get a free test for her? Try this website http://www.heartbeatinternational.org/worldwide_directory.asp

I have heard of individuals claiming that there are drugs that can cause no pregnancy. Most of the time, these are not reliable or dangerous. It is dangerous for her to take a drug that can cause harm to her or death. Also, she would have had to take the drug within a few hours of the sexual relations which would be too late now.

I recommend abstinence in your case. Why not get married to her?

Diane Cheryl