hi Julie,
Hope everything is going all right for you.
I conceived for the first time at the age of 42, had C section aged 43. Now 44 and ttc for no.2. I know what you mean about worrying about scans and blood tests. I worried non-stop during pregnancy. As soon as baby was born and the midwife gave him an APGAR score of 9 (best is 10), only then did I stop worrying. It's natural to worry and you'll never stop, just don't let it take over your life. Enjoy your pregnancy. It seems like a really long 9 months but afterwards you wonder where the time went. Enjoy the warmth of the bump, the movements, the hiccups. And don't forget to talk to bump. Apparently it gets bump used to your voice (and daddy's), and helps bonding.
Good luck
xx