Hello Doctor. I Am 26 Year Old Married Woman. I

Hello Doctor. I am 26 year old married woman. I am having irregular periods since the very beginning. Whenever I'm on birth-control pills my cycle is regular but once I'm off it they again go back to irregular. Some months there is a missed period as well. I am not overweight, fairly active and do not eat junk food on regular basis (in-fact I am a health freak). we are not trying to conceive but would like to in a couple of years. My query is will this irregularity of my cycle effect my fertility? Should I start taking folic acid/ omega fatty acid supplements?
Regards!