Originally Posted by Mike.Phillips
You'll be fine, and in fact you'll come back stronger than before. While people love to cheer each other one, and encourage each other to push hard, there is a difference between pushing yourself hard, and pushing yourself over the limit. In time, you'll learn your own threshold
Or else you won't, and sooner or later you'll seriously injure yourself.
The impact of being a slacker during one workout is much smaller than the impact of missing a month because you didn't know when to back off. Especially while you're new, it's smart to err on the side of doing less, not more.