I'm not even British and I find it pretty try hard and cringe and vom inducing
I also don't think she'd get pregnant. But she's finishing tour next year, finishing the re-recordings too. It's the end of literal Eras. By then she'll have been with this guy for over a year, provided they actually stay together. It could be a possibility.
I don't think celebrities make good parents (sorry, I just don't. To be a celebrity to begin with you need to have a serious narcissistic bent and that's probably the worst trait for patenting) but I guess she'd be less bad than most.