Hi :) First, I'm so sorry you're going through this and that you lost your precious daughter.
Like you I lost our DD1 to still birth around the same sort of time as you (14 weeks ago now, on 22nd Feb) at 32 weeks. I'm also 40.
I'm not going to focus on the medical side of things, but more the emotional.
DH and I are scared shitless too. We're fortunate in that we know why the still birth happened - it was completely unpreventable and caused by nothing we did wrong, so we have that at least. We're currently in a waiting period for results of a pregnancy test via the doctor - I'm 2 weeks late with AF, but have had 4 BFN's, but have all the pregnancy symptoms I had before, including the most bizarre ones that I had last time, which was throwing up every time DH drives anywhere with me as passenger and gagging on toothpaste!!
The way we are trying to deal with the idea of a new pregnancy, is that we have definite plans on how to make sure that DD1 is part of our lives and that we have let her go, but she still exists, IYSWIM? For e.g. I got a beautiful picture made of the date of her birth and death in numbers, with her full name underneath it. It's in our bedroom, so not on public display, but it's a reminder that we have a daughter. We've also decided that we do definitely want children, hence trying straight away.
DH and I also have had very candid discussions of exactly how we intend to handle another pregnancy - we discussed and agreed what he would find acceptable and could deal with (he doesn't want me riding my young horse who's unpredictable and flighty, but is happy for me to ride my old school master in the school, for e.g.) and we agreed that we would have a cleaner twice a week so that I wasn't lumping a hoover about the house, even though I work from home and have time to clean. We've also decided on what tests we'll have done, what scans we'll have (e.g. we're in Wales, so if we want an NT scan, we have to go privately) and we've made all the decisions together so we both feel in "control" of the pregnancy. We've got fantastic communication and he's also sympathetic enough to deal with my hormonal meltdowns in the right way!
It's going to be nerve wracking, scary, and we'll probably be completely neurotic and paranoid at every twinge, headache, sleepless night and niggle, in honesty, but my thinking behind it is that if I make a pain of myself with the midwifes and doctors, with scans etc, that's my perogative - I'm entitled to after what we've been through.
Feel free to PM me, if you want - I really do get what you're going through at the moment. :)