You are going to want to check your oil level sending unit. Any reputible repair pal shop in your area should be able to test the sender. Its possible it is the sender itself or the wiring going to it.
Get the oil pressure checked by a repair shop. Oil in the pan won't lubricate without circulation, and for that it needs volume and correct pressure. The oil pump's pick-up screen might be restricted and won't allow enough oil pass through or a failing pressure sensor. Don't risk your engine, take it to a shop.