Congratulations! Just remember - there's no stupid questions. They've heard it all. When I was pregnant with my son (1st preg.), I asked if I could still get a bikini wax - yes. Ride my bike? - no.
Just be prepared to have a whole bunch of weird things happen to your body. Continue to excercise, and just enjoy the ride. My oldest starts kindergarten on Monday, it goes fast!
Also, a lot of other responders said to start considering your birth plan - great idea. But, beyond that, consider your going back to work plan too. 1st - Do you plan to? Childcare? Breastfeeding/pumping logistics, etc. I nursed for 18 months, both kids, while working in a professional office, full time. I had a pumping schedule, a rotation of clean/dirty parts, etc. It's not an easy task either - but absolutely worth it and can be done. PM me if you have questions.