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Did the check engine light come on?
Does the light ever flash or is it on steady?
Yes if the performance does not change and the light does not flash there is no real immediate concern. However the fact that there is a moan there you should have the light checked out.
The check engine light indicates that the cars computer has found a fault in the system and stored it. It is ready to be retrieved ( the light comes on). Now you need to run an OBDII scan to find out what the computer has found. This can typically costs $90, however most parts stores will do it for free. Simply ask for an OBDII scan and print out. The print out will tell you what you need to repair/replace.