Can I recommend a book called 'the Gentle Birth Method' by Gowri Mowtha. Putting yourself in right frame of mind for pregnancy, labour birth etc. using good diet, visualisation etc. The sperm can hang around waiting for the egg so don't just wait for ovulation to have sex, do it several days in advance and you will increase your chances by several million times!!
I was 2 weeks away from 44 and had what i called pre-natal depression worrying about sleepless nights, nucal scan results and being a bad mum. When ds was born, all worries were unfounded and reality was nothing like I'd feared. Having supportive DH with previous experience was good too. Labour and birth were easy - no drugs, gas, tearing - and I would have done it again the following day it was so beautiful.
Try not to live in the future as you may never meet your grandchildren. Your DC may not have any for one thing. What is certain is you won't have any if you don't have DC in first place.
Just trust and ask yourself if this is something you really want. If so, and you don't get pregnant, all those I know who've adopted are just as close to their children.
I'm told i'm a great mother and ds is a gorgeous, intelligent, funny little boy. We love each other to bits. We take each day as it comes, but for me, they are normally packed with joy.