How long before you get pregnant after your periods?

Well, you're chances of getting pregnant increase around the time you ovulate. Which is usually about 2 weeks before your period. Here's two links that I think you might find helpful.

Detecting Ovulation, Ovulation Prediction | BabyCenter (http://www.babycenter.com/0_detecting-ovulation_484.bc)
Ovulation Calculator - Find Your Most Fertile Days Free (http://www.ovulation-calculator.org/)