Lenusik
I wasn't riding bikes when i was PG but i tell you what. I slept A LOT.
I held a job and took 3 naps a day. I slept well enough at night. but
I loved my naps. I had very little energy. I felt nauseated a lot but didn't lose
many meals.
If you can ride, that's great. But a lot of what your body is doing is
trying to put on some weight for you and the baby..so listen to your body
and save the hard riding for when the baby is in your DH's arms.
good luck