Tips for transitioning while being a biological parent?

There are fertility options for after HRT *if* it removes you're fertility. It isnt guaranteed to make you infertile and if you are still having sex on HRT you should still use protection when necessary as you can get pregnant even while on T. There's also freezing eggs and familial surrogacy but it might be a good idea to look into options that can also lower the risk of infertility like microdosing

If you have the money for it, you could get your eggs frozen. If that’s not an option for you, don’t worry - hormones don’t make pregnancy impossible, and there are drugs out there that can make it easier for you.