I'm going to apologize in advance here, because this info might make things more complicated for you...
When I had UC I took the pill for several years, and I felt that it really helped both with my period and with my UC around the time of my period. I had jpouch surgery in summer 2006 and developed a clot afterwards, which was most likely largely due to the surgery. It resolved with 6 months of blood thinners and I am fine now, but it came with the result that I am instructed to never take the pill again because ever having had a clot is a risk factor.
Upon further questioning my doctors about
my options, I was told by numerous doctors (gyn, pcp, vascular) that ANY birth control containing hormones carries the risk of clotting. This includes the NuvaRing and even the new IUDs that are coated in hormones, as well as the pill and the patch. If clotting is truly your main concern, this is definitely something to be aware of.
Once I finished my blood thinners I was able to get bloodwork that identified my pr
opensity for clotting as well as the risk factors (heredity vs hormonal vs some outside factor like surgery). It was a whole panel of tests, and required a lot of blood but they can find out all sorts of things. If your fear of clots mainly stems from your past issues, these tests might be able to better assess what your risks are now. I don't know the name of it, but my gyn knew about
it so your doctors should know what you are talking about
Also, in case you ever get to the point of having your colon removed (or for others who may be considering this) I learned after my clot that when the sick colon is removed and the inflammation levels in the body drop suddenly it is a risk factor for clots (more so than just your average surgery). Taking the pill near the time of surgery or right after can increase these risks if the pill happens to increase your clotting risk (which there is really no way to know). So basically, if you are having surgery just be aware.
Hope that was at least a little helpful.