I rode until 35 weeks with my first pregnancy (delivered at 38). I DID NOT ride a road bike however - all I had at the time was a mountain bike that I owned for 15 years with a really wide cushy seat which was ideal. I felt great - the only thing that was a pain was that my DH kept laughing at my froggy leg pedal style due to the fact that my belly was so big and got in the way...it was pretty funny looking back on it now - but this is not something to bring to the attention of a woman living with a 30+ week belly.