Maybe he did, maybe he didn't, we don't really know. From what happened with Desmond I think the facts point to it just happened now, so now all of the sudden Ben is going to "remember" all of this happening all the sudden.
I think we're in for an interesting explanation about what Ben does and doesn't remember from his childhood. I don't think it's going to go down like it did with Desmond. As Faraday said, the rules don't apply to Des, making those sudden memories possible.