Had my first child at 28 years old and planning to have 1-2 more. Not ready to get pregnant again though (my daughter just turned 1 a month ago). At what age will infertility become a possible concern of mine?

Here's a good read about infertility during ages 20s, 30s and 40s. I think at age 30, infertility isn't the only thing to worry about if you're planning to get pregnant. There are lots of risks for both the mom and baby although many are still able to give birth without complications. http://www.parents.com/getting-pregnant/infertility/causes/infertility-in-your-20s-30s-40s/