High Risk for Trisomy 21, 18 and 13

I am a mum-to-be at age 45 Have 3 healthy kids, with my 3rd child born 10 years ago Had a natural miscarriage last September Done some research on down syndrome and I know that it will not be easy But I have decided to keep this precious baby Wanna see if any mummies can share experience with me and encouragement to keep me going