A little advice on how to discuss fertility with my doctor!

Hi, guys!

My fiancé and I have been actively ttc for a year now. I've tracked and tracked cycles, and we are having no luck. I'm considering making a doctors appointment to discuss fertility. My cycles are usually regular, but every now and then a period will be WEEKS late. When I am speaking to my doctor how do I got about the conversation? Do I ask to be checked for PCOS or any other factoring problem?

My mother had no problem with having kids (she has 8), but my sister has PCOS and it has been severely difficult for her.