Yes I am all ways using mine.
Yes it's fine. I have a lower back injury caused by a drunk driver rear ending me at a red light.. I am 12 weeks n they suggested heating pads @ my doctors office n physical therapy
You should not be lifting AT ALL! Does your doctor know you're doing this?
I use a heating pad on high as long as its just ur back and not ur belly but if it makes u feel better u could also put a small blanket or rag over the pad