possible infertility?

Michaela
Are irregular but heavy flow periods a sign of fertility or infertility? 
I have really irregular periods, sometimes I don't have one for months at a time, but when they do happen they are usually extremely heavy for 2 days usually (rarely longer) and then stop completely again. 
So I don't know, could it be a sign of infertility? 
Edit: I've also never had cramps at all.