I agree, see a doc sooner than later....
I would see a fertility Dr my cousin is also very irregular like you and its pretty hard for her to conceive
It all depends on whether you are ovulating at all....you need to ovulate. So maybe you can visit a doctor and have a chat with them about your cycles and find ways to see whether you are actually ovulating and not getting your period.
Some women need to take medicines in order to stimulate ovulation.
It's already difficult for some women that do ovulate regularly and get regular cycles so if you it's going to be very difficult to pinpoint anything without having a cycle to follow.