Me, me, me!!!! Although I'm not currently pregnant, DS is 10 weeks old. I rode through DD's pregnancy 2 yrs ago, road, mountain and then my trainer from 33 weeks on. With DS's pregnancy, I only rode my road bike, mostly due to scheduling/babysitting challenges- ie, I can hop on my road bike out my front door vs driving to the trail head to Mtn bike. I had to stop at 34 weeks (all activity, boy that sucked) bc of concerns about my bp, but I was more confident this pregnancy and went on two to four 10-30 miles rides per week. Early on, I pulled DD in the chariot trailer, but only until about 16-ish weeks.
My only issues were needing to adjust my geometry of my bike as my belly grew. With DD's preg. I had just gotten a very expensive bike fit & didn't want to mess that up, so I just started riding the trainer so I could pedal while sitting up. With DS, I was over the bike fit, so I had DH switch my stem out for a longer one & raise my handlebars up to accommodate my belly, this helped immensely. I really never felt awkward or weird on my bikes, but did stop Mtn biking at about 20 weeks with DD, mostly because I have a tendency to wreck frequently!! I just made sure that I got out often to ensure that I gradually got used to my changing shape. My biggest issue was finding clothes that fit. I found a great pair of shebeest shorts with a wide, flat waistband that were so comfortable & wound up wearing a belly band under my jersey to fill in the space as my jersey got too short. One of my favorite bloggers also just completed an active cycling pregnancy & she has some great tips. www.pedaladventures.com
(used to be velomom.com).
Hope this helps & happy riding!! Both kiddos were born healthy 6#10 oz (DS) and 6# 14 oz (DD) & I think riding helped make pushing those babies out much easier!