Are there any novels that meet the requirements?

I once read a novel. I can't remember the name, but the content was roughly: The female protagonist was an unfavored princess who was going to marry the son of a prime minister. On the day of her marriage, she ended up with a prince from another country. Then, the prince left. She was called off. After a period of time, she was married back by the prince as his princess, but she was not favored.(The prince wanted to protect her.) Later, the prince went to war. She gave birth to a child and was chased out. She was killed on the way and was captured by the army. She was almost…and then saw the prince. I didn't watch it at the end. I wanted to see the ending. Unfortunately, I forgot the name! Which hero has read this novel? I beg for your name!