Don't know what to do. i was just thinking today to at least buy some clothes.
I'm only 24 so I would like to wait till 28 weeks to buy stuff. I don't have anything as well. My daughter is 4 and half, and after my second miscarriage I gave all the clothes away, and after my third miscarriage i gave all the toys away.
One of my friend, pregnant as well with complication, told me that she won't buy anything yet (she is not even half way) but she already put a lot of stuff in her on-line shopping bag or wishing list, so she has the peace of mind that she has already picked stuff.
I will at least buy some small stuff, and pick the big stuff that you need right away (crib, car seat, and stroller...). I do think think 27 it is save to start shopping.
Good luck
daniela