Yes in the 2ww you do produce the progesterone surges after the initial one wears off from your ovaries and that can cause some discomfort, but shouldn't be terribly painful for sure- basically like overworking a muscle. That generally is further along in the tww though like 7dpo and beyond, before that the corpus luteum is producing the vast majority of the progesterone, estrogen and other chemicals if conception happens. After the luteum loses its mojo the ovaries kick in to help with production of those two main chemicals and that can cause some discomfort which generally will continue through the first several weeks of pregnancy until the placenta buffs up and begins producing it's own progesterone and such.