Do some charting of your cycles. You're saying their irregular, but that can vary quite a bit. Are they say 1-4 months different, or are they say 28-34 days different. If it's the second one, you're pretty regular. Check this out Tcoyf.Com you can learn alot about your cycle and it will help your on the road to conception. It's not uncommon to be trying to conceive for over ayear and for you to be fertile. Alot of times stressing and trying to plan it out will make it harder to concieve. On the above website, there is alot of information on how to chart and figure your period cycle out a bit. (also the book of the same name is full of great information too!!)