Is this normal or i am being selfish?

Does anyone feel jealous or anything Bc their bf already has a baby and you don’t i feel slightly jealous Bc i am TTC with my first and i love him dearly and he always tells me that he wish he would of been talked to me whenever he had the chance three years ago (hes been crushing on me for three years and i didn’t even kno him lol❤️) and he hates his baby mama Bc she cheated on him real bad and he always tells me he wish i was the mother of his child and it’s just makes me jealous because i always said that if i get pregnant by someone i want the baby to be both of our first born 😞 we recently had a miscarriage last month so it’s just irritating