In need of some help

Hey ladies me an my husband has been together for 11 years we have been ttc after we was together for 3 years still haven't had any luck this would be our 1st child together. I don't have a menstrual cycle every month my last cycle was May 10 2015 an it only lasted for 1 day the longest cycle I had was back in 2013 an it lasted for 5 days. I've been to the health dept an they told me I could still get pregnant even though I don't have a period