So very sorry to hear of your losses (((hugs)))
There was a 10 year gap between my eldest son and the son I lost to neonatal death, we never thought we would have a child other than our eldest son. We were so shocked and amazed to find we were pregnant with our second son. Before I had even go to the twelve week scan I knew what I was going to buy, had a boys and girls name sorted, and had his/her future mapped out in my head'''''''''''''''''''''' I had so many plans and ideas, home coming, christening, schools (not local one that failed my son, had mentally put baby down for the other school we moved our other son to)..... lots of plans... none I got to do and that added to the hurt of loosing our son.
This time I have no plans - this time I don't really have names can't get excited thinking about sillythings like cot blankets things that I used to take great pleasure in choosing (mentally although never bought them) .I have only just (36 weeks pregnant) in the last couple of weeks really started to get stuff ready, only just started preparing the 3rd bedroom- I still can't let myself think that I will actually come home with this baby, I just can't think about it because of what happened last time. This does not mean I won't get to bring baby home, it is just my way of protecting myself.
I have got past my 'magic dates' I got past the time my waters went. Got past the gestation my son was born and died at.... and it has got easier passing those milestones but its still not easy. For very different reasons I too found scans really traumatic - at first I couldn't look which was again my way of coping, but now i can.
My only advise is take things one day at a time, just one by one and gradually it does become a bit easier. I really hope things go well for you (((hugs))) x