Issues conceiving baby #3

Jenna

I had my first two children (ages 11 and 1.5) with no issues. Was pregnant with both after two month of trying.

We have been trying for baby #3 for over a year now. I did 3 months of clomid with no success and dr prescribed letrozol starting this month. My progesterone levels have been great according to the doctor, but still no baby.

I have had intense pregnancy symptoms each month but then my period starts.

I was told I have PCOS which is new. Again never had any issues before.

Has anyone else experienced something like this? The sudden infertility seems so strange to me.