Am currently 26 + 2 with my first, and faring reasonably well all things considered except for one thing - if I sit for more than 2-3 hours, I get an extremely sore coccyx which then translates to a numb bum. I've seen that there are slopy cushions with a gap for the coccyx that you can get, so thought I'd give them a whirl as I'm going to be pretty much desk-bound for the next few weeks - has anyone used any of these and got any recommendations? In fact, any suggestions gratefully received!