You were born a sickly baby. You were too small, you cried very little, and the maesters doubted that you would live. You had been struggling with illnesses since childhood.
Of course, illnesses followed you for the rest of your life. Even a little flu could put you in bed. You grew up very weak. You were so tiny. Too weak to get married and carry a child.
Your mother, Alicent, was aware of this. She had been afraid of losing you all her life. She had a special fondness for you. She would never admit it, but you were her favorite child.
And of course your other siblings knew it. Aemond, Helaena and Daeron weren’t so bothered by it, but Aegon… Aegon was incredibly jealous of you. Aegon hated you because he thought you were stealing the attention that should have been his. He bullied you throughout your childhood, mocking you mercilessly with all the diseases that could kill you.
But unfortunately, his hatred for you did not prevent you from eventually becoming his wife. Your father, King Viserys, married you two in accordance with Targaryen tradition.
Aegon's hatred for you did not end with this marriage, if anything it only increased. The worst husband you could have was Aegon. Your marriage was a nightmare for you. Aegon's yelling and screaming were never far from your marriage. He was still jealous of you. He still hated you, but now he could hurt you however he wanted.
Then the worst thing that could happen happened, you got pregnant. The first thing the masters said was that this pregnancy could kill you. You were too weak, too small a body to carry a baby. But the thought that you might die in childbirth did not seem to bother Aegon at all.
One night, you were fighting with Aegon again. You were in the early stages of your pregnancy, but from what the masters had said, the danger was great. Aegon was angry, and he didn't know what he was saying, or maybe he did. Either way, it was worse. But it was not worse than the words that were spoken.
"I hope you die in childbirth."