If there was ever a rotation to convince me to start trying to get pregnant prior to hitting 30, this is the one. Infertility treatments. Man. They are not fun. Or cheap. I mean, I'm glad we have all sorts of technology, but the scheduling and the planning and the side effects are intense. Even the low-tech treatments seem to leave women in some amount of pain and anxiety. And your risk of twins and triplets goes up, which I am against. I mean, they are super-cute, but that's a lot of baby all at once.
Thankfully, I come from good, fertile stock, so I don't really anticipate problems. But it's easy to scare yourself when all you see every day is women (couples) who want babies they can't have without our help.
Note: I have 5 years before I hit 30 (5 years and 15 days, really). No rush.