Hi,
Like some of the others said, if he seems happy and is not cranky after he wakes up, then he's fine. The one thing I remember with my little guy was that as soon as I had his sleep schedule figured out (and he was consisent for about a month), then it would change. Seems like every 6-8 weeks it would change, so don't worry too much, just be sure to pay attention when he is awake. Fussiness usually means he's tired, especially if you just did something new or exciting with him, and remember, just about everything is exciting when you are brand new.
My son had sensory integration issues, so any kind of novelty or strong stimulation had the twofold effect of really getting him wound up and happy about the 'new' sensation, while at the same time taxing him in a way that meant he needed rest pretty much right after the fun activity, it just wore him right out, even though he was enjoying it, so for him he needed less stimulation, right away. That meant, a quite room, no lights, no rocking him to rest (that would just keep him from relaxing and passing out, took us a while to figure that one out). He might cry if he was really over done, but it turns out kids like mine cry to block out the other stimulation in the room that is over taxing their little systems. Anyways, you'll be fine, he'll be fine, just do your best to read him and expect it to change as soon as it starts making sense.
Have fun!
Keith