He did what???

Oh my goodness!!! My baby boy is 5 weeks old today and do you know what he did? He rolled over onto his tummy from his back!!! Are they supposed to roll over this fast? I wouldn't have believed it except that I watched him do it...twice! I should have known though because he's been rolling onto his side the past couple days.
The honeymoon is over... Now I won't be able to turn my back for a second. Wow...what's next?