Feeling like I’m ready to take a step back...

So the other day I had a sudden feeling of wanting to take a step back. My bf and I have been looking at houses to buy for our potential family home. No kids atm, we haven’t been trying but also haven’t been preventing it but we always talk about having a baby and we are both taking like fertility victimins to help increase chances of pregnancy.

Anyways, the other day he told me he’s going out to the pub next weekend which is fine . But then I was thinking to myself, wow , I don’t think I want to have kids because then when he goes out I’m gonna be stuck with the baby. I’m not gonna be the attractive gf anymore I’ll probably be the nagging mum. He might check out other girls. He might have more fun with other girls.

Idk I think this might make me a bad person and I think I’m going to sit down and talk to him and tell him I’m not ready anymore. Even though I know that he wants a kid .

It’s just that he is 29 and I am 23 so I feel like if we wait more years for me to be finally ready it might be too late because after he’s 30 there will most likely be less chance of pregnancy and it’ll take us even longer ?