Plus size TTC age 39

Bridget
Hi! I have 2 kids already. I had my first at 19 and my second when I was 33. It took me and my hubby 6 years to conceive. I am a plus size lady that wants one more child. We have been trying for almost 6 years and nothing. I am 39 plus size, pcos, diabetic and have hashimotos. Have any of you plus size ladies conceived this late in life?