there's never a safe time to have unprotected sex.
girls can even get pregnant when they are on there periods b/c the sperm can live 3-5 days (i think thats right) inside the girl. anyhoo its several days.
there is he rhythym method which you are talking about where you time sex not to be when your g/f is ovulating to avoid pregnancy. this doesn't really work.
here's a excerpt from this site about it
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Originally Posted by [b
Quote[/b] ]Effectiveness
The effectiveness of the rhythm method depends on how meticulously it is practiced. It also depends on the predictability of periods and consequently the ovulation period. In ideal circumstances the rhythm method could be 92% effective. This requires training and adherence to the guidelines of the rhythm method, which does not always occur. Therefore, for typical users the rhythm method is less than 87% effective.
Directions
Please see your doctor or family planning center if you wish to begin using the rhythm method. Ovulation occurs about 14 days before the start of a woman's period. Since sperm can live inside the vagina for up to 3 days, and an egg can stay fertile in the fallopian tubes and vagina for up to 3 days, intercourse must be avoided for more than just the day of ovulation. To be safer, a woman should abstain from sex (or use a barrier method) 5 days before ovulation, and 5 days after.
Drawbacks
The rhythm method does not protect against STDs and is by no means a flawless method of birth control. A woman must have regular periods for the rhythm method to work, and many women do not. Another major limitation is that even if periods seem regular, a one-time change in the timing of ovulation can alter the expected days of infertility. If that is so, a woman may be having unprotected sex during a time when she can become pregnant.
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i wouldn't depend on it. girls, especially when they are still yound and in early 20's do not yet have a regular cycle. it might come every time the same month, but that doesn't mean they ovulate EXACTLY the same time.
get her on the pill or use a condom.
maybe you should've asked these questions before you decided to have unprotected sex.