It is going to be different for everyone. Some of us just get pregnant easier. I was on the pill for 6 yrs, and off for one cycle when I got pregnant with ds11. Had never gone back on-got pregnant with dd9 when dh talked me into trying ONE time right as I was weaning my 18 month old. I was back on the pill for almost 9 years. At 35, I warned dh that it wouldn't be as easy this time. Well, one cycle later I was looking at a postive test! So it took me 6 wks both times, even after long periods of taking the pill. This time, I won't leave the hospital until they tie my tubes!