That sounds really tough. I have no advice to offer but really hope you find a solution that suits you... it's so hard trying to balance pregnancy and work, isn't it?
I'm self-employed and have work booked until 1st Nov when I'll be 36 weeks. At the moment I'm very full-on, although working from home which makes it loads easier. But from around mid-Sept I'm not going to take on any new work and just stick with my booked-in projects, so I should only be working 3 days a week until I go off.
For me the tricky bit is when to go back... all my clients are pestering me about it at the moment but I just don't know how I'll feel/what I'll want to do! I'm lucky enough that I don't have to go back if I don't want to, but I feel very torn about giving up the business I've built up over 5 years. At the moment I've told one client I'll pick back up in March but that's subject to change.
When is everyone else planning to go back? Four months seems very short but I'd only pick up one client which is about an hour's work per day, which at the moment seems manageable but, who knows! I'm clueless really!