I know at 5dpo the embryo (if there is one!) is only just becoming a blastocyst. It hasn’t implanted and there is no HCG. So I am not for one second wondering whether this sensation is anything to do with implantation as such!
Instead I am just wondering what it is and what causes it? It’s a low, heavy feeling as though my period is about to come on. It’s steady, it’s not in waves. Just wondering what on earth it is? Is it just a symptom of rising progesterone, like sore boobs?