Hey Belle,
Ya know what? Only you know your body, only you know how you're feeling and what you can cope with. So many people have opinions on pregnancy that stem from their experiences or (if they haven't had a baby) their ignorance. Only you can make a decision about when to stop work. It's hard to not feel guilty or weak, i know, but they are the feelings that are forced upon us by the current trend of "supermum" Must work, must have babies, must look like angelina jolie while you're doing it!!! Protect your pregnancy and your baby. You'll make the right decision! *hugs*