sick baby?

Be
My son is 10 weeks old. He's been very fussy the last few days! Wanting to comfort nurse a lot and wants to sleep on the breast often as well. He's kinda hot at 99.6 which is about a full degree higher than his norm, and also has only had one dirty diaper in over a week. His wets have gone down too. Is this normal behavior or does it warrant a doctor call? Hopefully not ER? Thanks in advance!