I hope someone can help me.

I have recently over the past few months i have been getting the collant light coming on the dash saying it is low. After checking shure enough its about an inch under the cold mark, so i top it up. About 2 - 4 weeks later it comes on again so i do the same again. Whilst this has been happening i have noticed that my exhaust emissions light has been on now and again but goes off after a while. Engine to my knowledge still has original water pump and belts but i cant be 100% shure about this. I look forward to any help you guys and gals can give. I just hope its not gonna be the head gasket.

Regards

Jonathan