If they are consistent like every 60 days, then try to figure out when u ovulate. Otherwise, a fertility doc may help. Mine gave me meds to force my period to start. Then I took meds to make my eggs/follicles ready. Then an injection that forced ovulation within the next 48 hours. Ironically, with this baby I ovulated on my own so I have a $50 shot sitting in my fridge. :)
Are your cycles just really long? Or just really irregular?