Karina i had subway when pg with Alex and it was one thing that i loved to eat while pg. I never had a probelm with it.
When it comes to the salad stuff i think they have such a quick turn over think how many ppl buy subway everyday. So i think it is fresher than you think.

I've also had it a couple of times with this pregnancy but have now gone off eating it.
Pizza is another thing i will eat while pregnant home made or even take away.