Weight

So, I am an thicker but athletic girl my period have always been regular never had a problem. I don't have time to always exercise everyday but I have stopped drinking. But, have been eating to my cravings. Can this cause infertility? Or is thicker woman having a harder time to conceive a myth? We've been to the doctor and everything was great. Now, I am reaching out to see if any of you ladies have suggestions. I am on a prenatal supplement don't drink coffee only water and a juice from time to time.