Big decreases at age 30, and again at age 35!
A while ago I posted on a similiar thread that I would rather be a mother and have a hard time with nursing school, then be a nurse and having a hard time trying to conceive.
I basically had a ton of women saying that age is no longer an issue, and that they've all had babies after 30 so it's no big deal. My little opinion was squashed.
I've been actively trying to have a baby for 29 cycles. So I can tell you that the earlier you try, the better chances you will have. Infertility sucks beyond belief.
To the OP. In addition to the blood tests that you can ask your GYN about (to be done on the 3rd day of your cycle), can I also recommend a book for you to read? It's an easy read, for sure. "Take charge of your fertility".
To get an idea of if you are having problems with ovulation, and to understand your body.