Last night I had what felt like horrible continuous afterpains that finally settled down after I took some ibuprofen. They weren't actually afterpains, though, because my uterus wasn't tight. Today my lower abdomen is a little achy and somewhat tender to pressure. I called my midwife and she suggested that it could be either a UTI, gas trapped in the abdomen, or retained placenta. I don't have any other symptoms of a UTI, my bleeding is normal and milk supply is good, and I've had gas trapped in my abdomen many many times and it's never felt like this. Any suggestions on what else this could be? I feel fine otherwise--could it still be a UTI?