Hi zoogirl17
You may not know the things I'm going to point out but if you do then bare with me.
First off you can not destroy or delete memory so all that old panic is still accessible. It was just buried.
Second any change in situation can send you searching for answers.
Third when you don't find what you want because of a number of reasons, fatigue being high on the list you will search associated memory for answers. Search deep enough and you will find memories of how panic used to be. Trying to block them will just send the search deeper into unwanted territory.
Associated memory can be things such as thoughts of pregnancy problems or raising children that has nothing to do with you at all but they come up because you have no solution in primary memory. Same with the panic thoughts.
The answer is a CBT technique. Acceptance of the situation and putting positive thoughts in as answers so there is something in memory to bury the unwanted thoughts. I bet you have memories of someone who had a bad pregnancy or someone who did a poor job of raising their child. The closer to you the stronger they will be. But if this is your first then you have no memories that are positive to draw on. You need to make some, starting with the fact that these are memories, not experiences, this did not happen to you personally. Even if it had of tomorrow is a new day, it doesn't have to be as it was. Positive thoughts. Somewhat like the rule innocent till proven guilty. There is no need for panic till you give it a reason to be there. Imagination is the random searching of associated memory and can work both ways if you have both good and bad associated memories.
I have no children but once got to hold a day old baby. The miracle of this buried every thought I had that had been stopping me from having children. It is still there.
Find some positive thoughts to bury the negative ones you are having right now. What you are about to do soon is very special and unique. Something worth celebrating every day. An experience. A good experience. A positive experience and that is how you want to remember it.
So in short think of all you can do to be a good mom rather than all that can go wrong. It may take some work but it does work.
Any question don't hesitate to ask some one will have an answer.
Davit
Ps, A friend used to have dreams of things unrelated but out of her control just because she was worried and had no answers.