Your fertile window includes the day you ovulate and the preceding five days. So, for example, if day 1 is the first day of your period and day 28 is the day before you expect your next period, you'd be fertile on days 10 through 15. (But you're much more likely to get pregnant during the final three days of this window.)
Your body will recover much of the psychological craving, that is, it will stop doing the cravings by 1 to 2 months after you have quit, and then it will be time to taper the pill and the patch.
For tobacco users trying to stop smoking, nicotine withdrawal symptoms are unpleasant and stressful - but they are temporary. Most withdrawal symptoms peak 48 hours after you stop smoking and are completely gone in 6 months. After that, you may find yourself eating more.