What Big said! Think of impact as anything that would make baby bounce off your pelvic floors, like running, cycling, jumping. That will add more stress to your pelvis, yoga will be good. I do a yoga/Pilates/tai chi class (all through my last pregnancy too) and had some bleeding after over doing the abdominal exercises last week but midwife said to carry on but take it easier next time as it will be good for my core and subsequently labour.
It is definitely worth getting something that would make moving stuff around easier for you, or if you are able to save it up and get a helper in (friend, partner, friendly postman) to do it for you. Moving things will only get harder as your pregnancy progresses so best to find some alternative/solution now.
Like Big I also found getting out of the car and turning in bed the worst and I only had a teeny bit of pgp, I had forgotten the tip about keeping your legs together, that does help, I suppose it reduces the strain on the pubic symphysis.