your health, age and regularity of your periods has more to do with how easily you conceive than the pill does.
if you’ve been having irregular periods before the pill, then you’ll most likely go back to irregulars after you’re off the pill (i.e. back to how it used to be) and if you are irregular then you are not ovulating regularly and hence you won’t be able to get preggo easily.
so. it has very little to do with the pill.
read this: Trying to Conceive: After Birth Control
this is what my doctor told me too and i trust her to know more about this than i do, so… yeah.
honestly, go see a doctor already! they’ll be able to answer all your questions.