Are these normal pains for 16 weeks?

In the morning I feel totally normal but by late afternoon and evening I’m having a lot of lower back pain and almost a dull shooting pain on either side of my back. It kind of radiates into my hips too. My uterus kind of feels heavy too even though I don’t have much of a belly at all.

I’ve been drinking lots of water and not standing too much.. basically been lazy and hanging on the couch.

Is this normal? Of course I made the mistake of googling and it says it could be premature labor. Anybody else have these sort of pains?