Squeak when under braking or all the time, front rear?
If when only braking then yes I would check the pads as mine are fitted with wear indicators that as you know are small metal pads that touch the disc once the pad has got to a certain depth.
It could be some debri has got lodged in one of the pads so check for that if the pads look good.
If its a squeak whilst rolling down the road then it could be a number of other things.