Mucus secretion  is normal as the pouch tissue is alive and waiting for stool and the normal mucous secretions will help things flow.

as far as pain in the pouch goes, I did not experience that, however since you are getting close to takedown the surgeon usually orders a pouchogram contrast study to check for any leaks or strictures prior to your final surgery.

have you spoken to surgeon to inform him of this issue?

The pain might be from tissues swelling and the internal “wounds” trying to heal. I felt pain before and after my reversal / takedown, what you call “reconnected”. Remember your insides have been manipulated, cut in half, moved around your pelvic cavity, and stapled or sewn up. Your tissues are in shock! I felt electric shocks in my stomach for weeks while I was healing, similar to static shock in winter time. My surgeon and the pain management team told me it was tissues and nerves knitting together and healing. Unless you have fever, bleeding, or anything unusual, try not to worry. Mucus is normal while everything is settling and your new pouch learns how to live a new life as a “colon”. I had that happen in the first few months, then it stopped completely. Remember you just had major surgery. It’s going to hurt while it heals. Eat lots of protein because protein helps tissues heal.