CONGRATULATIONS! That's so exciting.

I can say, from experience, you will probably be able to keep cycling through most of your pregnancy.

With my first, I found out I was prg about the same time as you. I kept cycling on my road bike until about 1-2 weeks before I delivered.

I did invest in a large pair of mens cycling shorts so that I could pull the waist band up over my growing stomach. You may be able to find some on clearance somewhere.

Things I learned about riding while pregnant:
1) Warm-up. I could no longer hit the group rides and take off at 20 mph. I had to go 14, then 15, then 16, etc.

2) I had to rely more on leg strength over cardio. A strange observation, but I noticed that I could keep a similar pace, but that I needed to push a harder gear at a lower cadence. Probably something to do with being at a comfortable heart rate.

3) Stay very well hydrated and don't overheat. Drink more water than you think you need.

4) Always listen to your body. If you aren't feeling great for whatever reason, back off and take it easy, or skip the ride all together. I found I had a few days like that, but I always bounced back a day or two later.

5) Endurance takes a dive. I could do a nice 25 mile ride, but once I hit that 25th mile, it was like hitting a brick wall--hard. I was done.

Those are the high points that I remember. With my second pregnancy, I even participated in an Adventure Race at 5 months pregnant. There was a 15-18 mile mountain biking section. We finished 3rd out of 20 teams

Good luck to you! And enjoy your riding. Its very therapeutic when you get further along into the pregnancy and start feeling like a blimp