IMO, all pouchers should be seen by a MFM (maternal-fetal medicine specialist aka high risk obstetritian - not a gyno, you see an OB for pregnancy), because the pouch surgery can cause specific complications or problems that a normal pregnancy would not encounter, such as blockages, tearing of adhesions as the baby grows and breaks up scar tissue (not much you can do about that) and then there's the issue of delivery and whether or not the "works" down there can withstand a vaginal delivery. Due to the results of medical studies, many doctors recommend a C-section for pouchers so that the continence of the mother is not permanently affected, but it's up to you and your doctor to decide.
Pregnancy and constipation go hand in hand. Increase your water, oil and fiber in your diet.