I met with the ObGyn yesterday. She figures that age is the biggest factor, and that the eggs are not great quality any more. (Wow! I really didn't think I was *that* old!) She wants me to wait two cycles and then try again, and she'll see me right away after a positive pregnancy test to monitor hormone levels, do an early ultrasound, and try some progesterone, although she doesn't think progesterone is the problem. She also wants me to take prenatal vitamins every day. I guess we'll wait and see what happens.