This is a great question, and unfortunately there are no good answers. At least that's what my doctor told me when I asked him about it.
I've been on the pill since becoming sexually active-- It's been about 7 years now. I've never had a problem with it. I'm begining to worry about blood clots though. I'm less ambulatory now than I was as a teenager, and sit in my wheelchair much more. They won't put a woman with a spinal cord injury on the pill, but they will put someone with CP who uses a chair part time on the pill. If you want to go on the pill but use a chair, get familiar with the signs and symptoms of deep vein thrombosis, so you know what to watch for. This is actually true of all women on the pill, not just those who use chairs. But wheelchair use does put a woman at greater risk. You can also be tested for Factor V Leiden, a gene that makes blood clots more likely to occur. If you carry this gene, they wont let you take the pill at all.
Would love to hear your thoughts about parenting while disabled. It's something I've been thinking about for a while now.