More than likely your oil pressure is low for some reason or too high sometimes when it is cold the oil gets thick and then it triggers a sensor because the flow presure is to high I dont know if this is the case but in order to get a deffinet answer you would have to take it to a shop to see if there is a stored code on the computer
If your Oil light goes on and you bring your vehicle into your dealer, or local mechanic or whomever you trust with your vehicle services, and they tell you that you did not need an oil change, you may have just needed a top off of fluids. Depending on the dealer, this is usually a rather quick and harmless process that will, after approximately 50 miles of driving, allow the light on your dashboard to go away.
The best thing to do is to call your dealer or local mechanic and explain what exactly is going on with your vehicle. They will either be able to diagnose the problem, or lack there of, over the phone, or definitely by bringing you in to the shop to take a physical look and evaluate the vehicle.