@cssbear,
When I talked to my doctor about this she said that it was really an individual thing. She said that I shouldn't
expect to get pregnant until several months after I went off the pill, but that I might become pregnant immediately after stopping, and that was fine.
It ended up taking me about a year after I went off the pill to get pregnant. But again, it's very individual. It's not as simple as saying "if you stop taking the pill now, you will get pregnant in March."
I'd suggest talking to your doctor/ gynecologist to see if there is anything in your history that gives clues and to just generally get his/ her input. But when I was researching this (about 12 years ago), the bottom line is that you CAN get pregnant at any time after you stop the pill, but it's most likely that it will be at least a few months.
Some of the variables include how old you are and how long you have been on the pill. (But there are a lot of other variables, too, and many of them are unpredictable.)
Good luck.