I think I understand now.
If under the same circumstances it sometimes shows 1 bar and sometimes pegs, then there probably is a problem. I'd start with checking the wires that connect to the oil pressure sender. Maybe one is loose or frayed. It's hard to check the wiring into the gauge cluster but it's a relatively mild and clean environment back there.
As to whether it's safe to drive the car as is for another two weeks, that's up to you. You essentially have an unreliable gauge of one of your engine's vital signs. If it shows 3 bar when you think it should show 1 bar, it could show 3 bar when it's at zero. You have to decide how likely an event that is.