if I should listen to my doctor and suddenly go on biologics when (I think )my symptoms are ok.
A cautionary tale on this thinking process. I was in a similar boat, I was living with my 4-bms a day and mild urgency. It was tolerable, I had adapted around it, and I was only after all only a "mild" case and happy taking only Lialda and rowasa. I had been reading this forum and was confident that was the right choice, and read many others fears of hardcore meds like 6MP and remicade (forum was very biased and very much against those meds except as a last resort before surgery at that time ~2012). So I told my doctor no on the 6MP when mentioned at several consecutive apts.
It's kind of like the frog being slowly boiled in a pot of water, I had no idea what was going on inside me...THEN came the flare of all ungodly hell. I was suddenly going to the bathroom 25+ times a day (about
every 1/2 an hour while awake, and every couple hours at night), I had sharp knife-stabbing pains that took my breath away, and was nearly incontinent. I was given prednisone and had endoscopy and I was now a severe case and had spread in extent muktiple times of what it had been before, good bye mild severity and limited extent. It took me a whole year to get out of that flare, first trying only prednisone, second adding 6MP, and third adding remicade to the rest. I wish I had taken the remicade and/or 6MP before that flare ever happened, would've saved myself a lot of suffering.
That's my story, no guarantee i'll be you by any means. But just a reminder that "doing fine" isn't really fine in some cases, inflammation can slowly build and spread right under our noses and invite one dozy of a flare when we least expect it.
Biggest recommendation I can give is validate "doing fine" with some inflammation tests, a Calprotectin or C-Reactive Protein. Verify it is well control, and do not just assume what you're doing is working, and disregard doctor's recommendations foolhardily.