No it can't. Your baby is well protected and you will be fine to lay on your stomach if you really want to - expecially in the first trimester. Once you start to get bigger though, baby will let you know when its time to stop.
It is advised by doctors that you shouldnt. They suggest that you should lay on or left side.
At 8 weeks you probably don't even show yet. I had 3 children I always lay on my stomach until the belly is big and showing