Conceiving / periods

My periods have always been very irregular when I was younger I was on the pill and ended up falling pregnant at the age of 16... 5 years on I’m now happily married to my sons daddy and we’d love to have another child after just getting married. We’ve been trying now for 2 months I know it may not seem like a long time but I worry because I’m not always getting a period I’m not ovulating which stops me from having another baby.

I went to the doctors and my last period was 11th of July and lasted 3 days. I was told to come back for bloods when my next period comes but the last one was 5 and a half weeks ago and still not had anything and I’ve checked but I’m not pregnant I now worry we won’t have another child. Still early days but because I want it so badly and this baby will be planned I worry it won’t happy.

Anyone any idea of what could be wrong ?