This sounds like me exactly First attemp ended tearfully in a m/c and I honestly believed that I would never be blessed with a little one. When I finally fell pregnant both my DH and I decided not to tell people until we were sure, so we told parents/siblings at around 8 weeks, then everyone else at 12 weeks (well actully DH splashed it all over facebook LOL I think he was excited). Well, at 12+1 I had bright red bleeding and it scared the heck out of me. I rushed to the GP who didn't seem too concerned... and to be perfectly honest, I have spent every single day since finding out I was pregnant just holding my breath and hoping that all goes to plan.
Well I now have just over 2 weeks to go (and yes, I still worry about complications) and I totally understand where you are coming from but all I can say is take each day as it comes. I started buying baby goodies here and there after the 12 week mark, which helped it to feel more real and make it a more positive experience for me. I'm sending positive vibes your way ! Best wishes for a happy, healthy pregnancy and a bouncing bundle of joy