Checking you temp is a great place to start. You can also track your CM and use OPK's. There is a fantastic book called Taking Charge of Your Fertility by ToniWeschler. It will tell you everything you need to know about charting.
thanks, well im not gunna worry about OPK's right now, no point in spending the money, i am focusing on just getting to know my body right now. strange thing is, im CD13 and my temp dropped, and i got mild cramping this morning, i thought you were supposed to have a surge in your temp when you ovulated? according to my chart i should ovulate Saturday. i know for a fact though that i got pregnant with my middle daughter the day after my AF ended, because it ended, i was intimate with my ex husband, then we separated, long story, but we were separated for 3 months, and i was prego with my daughter. so... im wondering if im one of those rare people that have a different cycle, hence the reason im tracking, just to see when i actually do ovulate, so that when i get my reversal, we know when and how my body functions.