Depends what you're looking for, but may be worth speaking to a lovely lady called Susan, who coincidentally has recently been recommended by another user in the 'how to get rid of mummy tummy post':
http://www.nappyvalleynet.com/viewtopic.php?f=31&t=9256
She is a former professional dancer who has two children, so she knows a lot about both fitness and pregnancy - and I know she has pregnant clients. She has an incredible knowledge of anatomy and uses that, combined with pilates based exercise to create a tailored set of exercises. However, she's also a keen runner, so could probably do more cardio vascular stuff too. She's helped me hugely post birth (I too had a large bump and as a result had awful back pain and hip problems) - I'm now thinner than I've ever been, fitter, stronger, more flexible, and have no back pain (after 6 years of problems) so I can finally face the thought of getting pregnant again (I was too scared of the pain before). She's expensive, but I think is worth every penny - I've now stopped going to physio and chiropractors as Susan is helping me solve my back problems / fitness for the long-term rather than just giving me temporary relief.
If you find a good nutritionist I'd be interested to hear - would be good to know about for any future pregnancies.
Good luck!