Head gasket

The coolant is disappearing quickly but I have not found a leak. The coolant warning light came on and I stopped the car immediately and turned it off. I opened the hood and looked at the coolant level and it was low. I waited thirty minutes with the hood up for the engine to cool off to add coolant but when I went to go to that, the coolant level was back up. Then this morning when I was checking the fluids, the oil on the dipstick looked strange, bubbly and lighter in color. I wiped it off and checked again and it was the same. I checked it again about ten minutes later and it was totally normal. It was particularly cold last night and this morning so maybe that has something to do with it? I checked for other signs of a blown head gasket foamy stuff on the engine oil cap and oil in the coolant tank none of that as far as I can tell. I am wondering if this sounds like It could be a blown head gasket because I should probably stop driving it if that is the case.