BW, just did a little bit of reading as I was interested to know as well about compacting.
By Day 4, the cells have divided rapidly but the embryo has not yet increased in size. It is now compacting (you cant distinguish the cells) and is called a morula.
So, it just seems they are a day behind but they are still progressing so hopefully will be ok tomorrow.
I'm happy you're feeling better and are now well and truly over the worst of things.

BG, I had the same problem with Elevit when I started. It took about 2 weeks until I started to feel normal again!