Another plug for www.fertilityfriend.com too.
Also, you might want to pick up a copy of Toni Weschler's "Taking Charge of Your Fertility" to learn more about your cycle.
I feel like a broken record every time I suggest this, but using both methods WORK.
They do not involve freaky herbs, wacky medicines, etc. You will learn a lot about your cycle, be able to determine your fertile window, and better prepare yourself for conception NO MATTER how long your cycle is. I think I'm living proof of this; I charted for 4 months and ovulated on day 41 (41! that's so far away from 'normal ole 14) of a cycle and am 3+ months pregnant.
I strongly urge you to go get the book and go to the fertilityfriend website and see what you can learn about becoming successful! Best wishes!