My clock started ticking out of control when I hit 31 ish, I'd been with my partner 4 years, knew we wanted a baby together and really felt ready then.
He wasn't ready. I cried, we talked. We revisited the convo in 6 months of I remember correctly.
Again he wasn't ready. Wanted to get married and buy a house first which, which we are currently doing.
I told him it was painful how much I needed a baby now. I didn't want to be much older and I was ready now.
He wasn't happy but understood, and as we planned to have a baby at some point he agreed to try, reluctantly.
Trying was crap, was stressful and disappointing and made sex rubbish.
We now have a toddler! OH adores him and thanks me for nudging him in the right direction, as my partner is, like many men, reluctant to veer off his black and white path.
Does your partner want a baby with you? Are you sure you are ready together?
Statistically you know someone as well as you can know them after 4 years, why not have a discussion and see if you can revisit in 18 months as someone else suggested.
In the meantime get some savings behind you, and take some foreign holidays.
Having a baby is wonderful. But it is hard, and life changing and stressful.