At what point during my cycle am I most fertile?  

It takes a while for your periods to come back after you stop taking the pill. For most women it's 2 to 4 weeks before you have a period, but this depends on the individual and what your cycle is normally like. Weight, health, stress, exercise and conditions such as polycystic ovarian syndrome can all influence the cycle of periods. Your periods may be irregular when you first come off the pill, and you should allow up to six months for your natural cycle to re-establish itself fully. It's quite common to have a longer delay before normal periods start again after stopping the pill, especially if you have run two or three packets together. This is because the pill contains the hormones that stop ovulation (the release of an egg) each month. There appears to be no connection between how long the pill has been taken and having fertility problems. Some women conceive immediately after stopping taking the pill. While the pill doesn't cause fertility problems, it does mask problems that were already there, such as irregular periods. As soon as you come off the pill, you can get pregnant. It's therefore important to use another form of contraception, such as condoms, straightaway. If you're trying to get pregnant, it's a good idea to wait to have one natural period first. This gives you time to make sure you are in the best of health for pregnancy, for example, by starting to take folic acid supplements and quitting smoking. It also helps your GP or midwife to predict your due date accurately.