C.H.
I would definately take it easy up until 3 months time as to lifting, carrying, pushing, straining, climbing stairs. Just for the in-case. I had that in one pregnancy. I took it easy. Everything went fine.
I would find out what gave you the miscarriage before in case it came from an anomoly that you can't control; e.g., the uterus may be divided by a septum and the egg attaches itself to the septem instead of the outer wall. For some, this type of scenario would be a high risk pregnancy for which you would take certain precautions.