TP, firstly , a miscarriage is just awful. I had mine a year last march. It was about this time last year that I got pg again, and I now have a wonderful 3 month old baby. However, it was a very very difficult pg, and (trying not to be negative) I hope I can help you to avoid the mistakes I made.
Oh, and before I forget, the decision to go for it again was made during a particularly boozey holiday, and the baby was conceived during the worst hangover of my life. The one I lost came after 6 months of complete abstinence!
Anyway, my mistakes ... I totally threw myself into work in my 1st trimester. I launched a new ptoject which needed a lot of work, and continued to apply for promotions. All this on top of my usual commitments, including ds1 who was 18 months old at the time. I ignored all the tiredness, nausea etc. and refused to give in to it - basically because I had done so the time before, and all for nothing. So this time I didn't want to sacrifice anything. Stupid, I know. I now realise that after the mc I had even more reason to take it easy.
Scans were really really difficult. I had to have dp with me for every single medical appointment (he'd not been with me at the scan that diagnosed a missed miscarriage). And after every healthy scan I assumed that while he'd been a happy healthy baby on the scan, that was 10 minutes ago, and you can die in 10 minutes, can't you ... With hindsight I would have booked the whole day off work (and maybe the day before too) to cope with scans.
I also didn't slow down in my 2nd trimester. I bled from 13 - 16 weeks, during which time my team was inspected at work - so I ignored the bleeding and threw myself into the work. Then just as the bleeding and inspection finished, ds1 got an ear infection, then I got sinusitis. By 20 weeks I was completely burnt out. By 26 weeks I was on sick leave.
I was very very silly. I refused to devote any energy to the pregnancy because I was so convinced that it was going to fail. I wasn't happy until I had the baby in my arms. However, the moment he was there in my arms I was madly in love with him, and I have not had a bad moment since - not even the baby blues.
I hope I haven't been too negative, after all my story has a most wonderful, perfect ending. Just please avoid the mistakes I made and be good to yourself.