hiya, pharmacist.
i havnt heard of that particular side effect in any of the texts, but id put money on it being the dnp. could be a lot of things, but sounds like your endometrium is absolutely shitting itself and not lining the uterus like it should...i would put an educated guess on some sort of interference with protein synthesis, since thats something thats critical in that area, and dnp is fantastic at stuffing that up
it would not hurt at all to go and get an exam. really. dont take chances with your reproductive tract. just go in, get looked at, make sure its not something sinister or that there are any glaring nasty features to what you have
sounds awful though. good luck, keep us posted. the more that know, the better