How do i decide to have children?

All my life i was quite determind that i didn't want children, but now i can't decide if i should or not.I am soon to be 37 have had a brillant life travelling around the world, basically doing what i want to do. I am now married and my husband is eager to have more children.If i wasn't married i probably wouldn't think about it as i wouldn't want to bring up a child on my own, i feel my body clock ticking to decide, not cause my husband wants one but cause of my age (sister, mum and gran went throu menopause b4 40) . I still don't feel ready to have one but i feel if i don't try i'll regret it!Should i try and just leave it to fate. if i do i do, if i don't i don't. help!