Another regulator question.....

This is my first attempt at kegging and have read as much as time allows.
I have a new single keg regulator and a used Pepsi corny along with new hoses and fittings.
My question is that I have my reg set to 30 psi for the last hrs and it will dip down a few psi after a few hours or so. I made sure that all of the fittings were tight on the reg and sprayed them and the keg down with soapy water while under pressure and got no noticeable bubbles. the reg stops running after initial opening of the valve within 5 seconds.
Is this a normal drop in pressure? Or do I have a real small leak?

Probably just the beer absorbing the CO2...

Small leaks would still be able to be seen with the soapy water...

Thanks, It has seemed to level off now. Damn stupid noob question.