Relationship today!!!

So I’m finally in a place in life where I’m truly happy. But there’s an issue my boyfriends 25 and I’m 19 soon to be 20. He has 2 kids already and it’s not impossible but hard to have a baby for myself. Is there an issue with us being 6 years apart and him have 2 babies? He doesn’t treat me any less and I let him have time with his kids and enjoy that moment. But I need input and advice please

Ps sex is great😍🤦🏽‍♀️