Thanks for all the advice! I am, right now, just under 8 weeks and still feeling like I drank a whole bottle of NyQuil. My next question is... (hopefully!) in my next trimester when I am feeling more energy, can I bump up my milage and duration of my workouts?
Not that I would try but what about weight loss? If all I have been able to do so far the last few weeks, is occasionally run, lift and spin class, then logic would dictate that when I start feeling better and bump up my workouts to closer to frequency and length that I am used to... would I loose weight? If so, is this unintentional weight loss dangerous?

Good suggestion about putting your mountain bike saddle on your tri bike! Brilliant!