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They give the time frames in terms of months because there is only a few days over the course of a woman's menstrual cycle that it's possible to conceive, and provided you're having sex around that time it doesn't make much difference at all if it was once or ten times during the fertile time.
On average, regular unprotected sex during a woman's fertile time has about a 1 in 3 chance of conception. Have you missed your period yet? If you've been carrying on like this for about 3 months then your chances are quite high that you are in fact pregnant.
If you suspect pregnancy, and are late for your period, take a home pregnancy test. You won't find cold hard stats out there about your exact chances -- scientists and statisticians spend their time and energy (and rightly, I might add) on evaluating how effective forms of birth controls are and fertility treatments for those who are having problems conceiving to bother calculating exact stats on something like this. About the only cold hard fact you can count on is that if you keep this up, you will get pregnant.
So if you aren't trying to conceive, then start taking responsibility and NOW. Condoms are cheap and easily available. Or your doctor can prescribe the birth control pill. Use one or the other EVERY single time you have sex.

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