This morning my car stalled when I turned on the engine (left it in gear the night before, stupid me) and my oil pressure light came up for a few seconds then it disappeared. Will it be fine?
This site already has a few "what gear to leave a parked manual". Answers vary but I have found no evidence (neither on this site nor elsewhere) that parking in a low gear is actually harmful. Actually, that was how I learned to leave a parked car.
As for your question, I would advice that you check the engine oil level. If normal, nothing to worry about.