I had someone come around and look at it and they said it might be scollop,
if I remember correctly a scollop shell is mostly flat, this creture had a
slightly curved shell.

Tonight I looked at the rock it originaly came from and I saw the exact same
white egg things. If it is a mollusk, how long before I would see something
growing ?

could be mollusks spawn by releasing sperm and egg into the water
column.ive never heard of them depositing egg masses on substrate or
rock,equipment etc....