Don't do hot baths. Get an ice pack and use it every two hours for 20 mins at a time until the pain lessens. Then use it between 1-3 times per day. Avoid walking, bending, lifting. Get a special belt.

I am now in the tailend of my pregnancy and was told at 7 weeks I would be in a wheelchair very soon. I'm now in less pain than I was 12 months post-natally last time because I'm managing it properly. I can only walk 50 metres so have to use a wheelchair for further than that and am consequently pretty much housebound BUT I CAN still walk around the house only because I do ALL the things I mentioned in that first paragraph. For me, icing and rest have been the keys. I was doing clinical pilates up to twice weekly too but have found this is not as vital as the icing and resting. In bed, put a pillow between your knees - honestly, it sounds so simple but it really works.

Good luck!