You never know if it works out or not.
I can only speak of my own experience: Me and then partner decided to try for baby when I was 40. Had only been together just over a year and not living together (although by then we wanted to move together and both our properties were on the market).
I got pregnant successfully in the third cycle (second cycle resulted in chemical pregnancy).
Today happily married, living together, with a wonderful DD who is almost 4.
There are no guarantees in life.
Yes, your man could turn out to be a d*ck. Yes, you might never get pregnant. Yes, you could have a baby with chromosomal abnormalities. That’s a real risk. As long as you make an informed decision, that’s ok.
You could also wait until you’re 50, find out you’re with the best man on the planet and realise that you’re menopausal.
Personally, I think after a year you can trust your instincts whether a guy is good for you or not. If he has managed to fool you for a year, he can also fool you for two.