Conquer UC, Pentasa suppositories or enemas are not going to be effective in the small bowel because they are never going to get to the small bowel. I was talking about
Pentasa taken orally. It seems that Pentasa enemas are very helpful to folks with inflammation in the sigmoid colon and rectum, much like Rowasa enemas and generic mesalamine enemas. I don't have a good enough understanding of the different kinds of 5-ASA molecules among the different brand names to explain why one enema would work better than another, but if it's working for you, don't stop.
On the other hand, if you were talking about oral Pentasa, then yes, it is worth a conversation with your GI to discuss whether to continue with Pentasa or choose a 5-ASA oral med that is active mostly in the colon (Pentasa is the ONLY one that is active in the small bowel - the others all target the colon).
As far as getting pregnant goes, visit infantrisk.org. There is a lot of info there about meds and breastfeeding, and on pregnancy also. I don't recall seeing any concerns about 5-ASAs and pregnancy. Most of what I remember reading was about these meds and breastfeeding (some may cause watery diarrhea in the nursling).