I too rode throughout my pregnancy with only good results. I dialed it back, of course, and kept within my comfort level and REALLY listened to my body (not always easy).
Personally, I found bib shorts worked best for me, because they're pretty low cut and not constrictive around the waist.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Bike clothes while pregnant?