Hello, congratulations and welcome Avalon! I was 41 when I had DD at the beginning of the year. Spent my 30s mostly single and as time went on I realised the chances of having children were dwindling. Met DP 4 years ago, and finally got pregnant at 40. Was completely delighted, then soon became anxious/paranoid (didn't help that I was 3 days into a new job when I found out!).
The first trimester felt like it went on forever - all I can say is that I just aimed to get to the end of each day, and then I was one day closer to the scan date. I second the advice of getting an early scan if you can afford it, even if it's just to break up the expanse of time! Post scan, the days became weeks, and then quickly months, and as I started to feel more normal again it was easier to just get on with life.
Oh and please don't worry about your sadness affecting the baby. By all means do avoid stress if you can, but many people I know (myself included) have dealt with major life events while pregnant (bereavement, relationship problems and so on) and the baby was fine.
Anyway, we are here to hold your hand and between us have a wealth of experience and knowledge about having babies after 40.
I'm heading off to bed now. Hot toddy has been drunk, DD woke briefly soon after going to bed but am hoping that's it for a few hours now. My throat is very sore and I feel so tired. Really thought I was going to be going to a job interview this week, but if they rung now I don't think I would pick up the phone!
Hope you all have a very peaceful night with uninterrupted sleep. Night night!