How much is too much?

This past February I found out I was pregnant-whoo hoo! With that news came, and continues to come, a whole host of changes which I won't bore you with in most cases, except when related to running.

Running has been a huge part of my life since I was a 14 year old wannabe punk, and my father told me I needed to "get involved." I joined the cross country team because you didn't need to try out, and have been running ever since. It has kept me sane through stressful jobs, relationships; introduced me to some of my closest friends including my partner; and eventually brought me full circle back to coaching high school cross country. The idea of not running, or even slowing down because I'm pregnant, freaks me out. It is such a central part of who I am.

So while I am trying to avoid sucking too much of my life away online reading mommy-to-be blogs/commentary, I have made an exception for any and all information I can find about running while pregnant. Unfortunately, the pickings are slim and of course do not all point the same direction. General consensus however seems to be:

1. Keep on doing what you did before and you should be fine
2. Pay attention to what your doctor says
3. Pay attention to what your body "says"
4. Don't get your heart rate or body temperature up too high

Easy enough, until you get to #4. Does that rule out speed work? Hard workouts of any sort? If your body is used to a high rate of exertion, can you handle more than someone else may be able to take?

I'm continuing to troll the internet for evidence that significant training can be fine during pregnancy. What I want is a sense of what a fairly, but not too, competitive runner should expect from her body. Somewhere in between how Kara Goucher and Paula Radcliffe trained, and the "easy running is just fine" approach. This will help me figure out what to try myself as well as how to better advise the adult runners I coach who come to me with similar questions.