Tui moi co ban gai. She is a virgin. Ban gai tui khong co kinh hang thang. Sometime she doesn't have it for 3 months. The last time she had her period for 10 days, and about 5 days later ( 15 days from the day she had period) we fooled around. I didn't put it in. I just put my soldier outside her "chim"....Is it safe to avoid prenangcy?