Irregular cycles :(

So I know this is probably not the right group to post in but I want to hear from some lovely pregnant ladies!! When I went on birth control in college I was much smaller than I am now. So once I quit BC I think my weight is causing my cycles to be irregular. 1st was 28 days which was just like when I was on BC 2nd was 32 days 3rd was 49 days and now I’m on CD 40 :( I’ve read that it’s so much harder to get pregnant with irregular cycles and I have this fear that I’m to fat to ovulate - I’m at 300 pounds - just looking for some success stories or encouragement! 😀