I've read this a long time ago and have forgotten which novel arc it belongs to soooo apparently, In the first world(i guess), Mc is a concubine/empress who was pregnant and was heartbroken because his emperor/childhood sweetheart, who promised him(og owner of mc's body) that he will only love him, however found himself another man... so mc proceeds to guilt trip(?) Him then the story progresses..... the emperor regrets it but mc eventually died because of blood loss(?) Due to childbirth. I remember that mc had white hair at that time and that his child resembled him.
Does a ring a bell. Is the MC’s surname Bai? Let me know if it is so that I can look for it. I’ll have to go through my reading list to find it and it might take a while...