That is a very interesting article, mickle.
I didn't cycle when I was pregnant but I did play the organ all the way through my first two pregnancies. This involves quite awkward positioning (two hands, two feet, 3-4 manuals and pedalboard) especially when one is small in stature. The bump wasn't a problem as my daily practice enabled me to make subtle adjustments its growth. I played less often during my third pregnancy and found it much more challenging to cope.
As a cyclist, I imagine regular cycling throughout pregnancy is very possible, particularly with an upright bicycle. My biggest fear would be getting knocked off.