It literally varies from one woman to the next, to be brutally honest. There have been studies and reports that claim if you've been on a method of birth conrtrol [condoms don't count] that it will take longer and be harder for you to conceive, at first. Some women, like me, get pregnant if their husband looks at them cross-eyed [not always the most desired ability!]. Best thing to do if you are serious about becoming a mom is to make sure youre healthy. See if you can get a thourough checkup or physical at your doc's, to rule out any complications that may prevent you from conceiving, or that can be corrected early on. Excersise, even if it's just walking for half an hour a day. A healthy diet can only be beneficial for you, which would be the life support system for a baby to feed off of for 9 months. My doctor gave me prescription- strength prenatal vitamins when I wasn't even thinking about kids- you can request them or go buy regular ones at the store- you don't need to be pregnant to take them. They will give you things that you may be missing from your diet, and you'll be ahead of the game if you already have them in your system. They don't, however, make you any more fertile.