Conceiving with irregular periods

S
I have irregular periods they vary from 32cd to 37cd. I have been trying to conceive for 9 months, I use opk's and track my cm. I'm waiting to go to my doctor until I have been trying for a year! All my checkups have been good and there should be no reason I can't conceive that I know of. Is there any vitamins I could take? I think I'm going to give preseed a shot this month. Any advice would be great! Baby dust to all💖