Hi huggybear17!
Without being on the pill, I rarely (if ever) have a period either! I went through hell with a very incompetent doctor for a year. (Find one you can really trust!) I recently switched to a new doctor and was diagnosed with PCOS (Poly Cystic Ovarian Syndrome), which I guess is one of the main causes of a lack of period.
There's good news and bad with PCOS. My husband and I have been TTC since the end of June 2010 with no luck. I was diagnosed in June of 2011. Sometimes medication and weight loss are enough to bring on a period. I'm not severely overweight, but could stand to lose a few pounds. The problem was that I could starve myself and spend hours on end in the gym and be lucky just to maintain my current weight. However, after being put on Metformin, I've lost 16 pounds in about 3 months!
On the baby front...I've been on birth control for the last 3 months while starting the metformin to try to induce natural periods. My husband had to go in for semen analysis, which came back normal. I'm going in next week for an HSG. That's where they insert dye into your uterus and fallopian tubes to check for blockages. I tried clomid (a medication that's supposed to induce ovulation) with the last doctor with no luck and may try it with this one.
It's a lot harder to conceive with PCOS than without it, but it's not impossible. I'm still hoping we don't have too many troubles. However, it's been a long and emotional road. If you're really serious about starting a family right off, I would start seeking help now!
The other ladies' suggestion to seek the advice of your OBGYN is right on. That's where I'd start. Honestly, sitting there and worrying about what disorder you may or may not have is a lot more emotionally scarring than hearing and accepting a diagnosis. I'm not going to lie, I bawled like a baby when I got home after being diagnosed. However, putting a name to my problem was comforting, too, because it meant that there was a course of action to take to hopefully make me a mommy someday.