Bieng 32...

Since I've gotten in my 30's I've noticed a steady decline in my fertile stage. I was 31 when I found out I was pregnant of my now 8 month old in September 2014 after months of trying. We have been trying months with no luck. Last month my period was very irregular when it never was. My husband wants a son but I feel down that it could be me it ain't happening... Any thoughts?