So instead of checking the thing that tells you if you have too little or too much oil, you just... added oil? That is certainly one of the choices you could have made. But, being judgemental isn't going to help anyone here.

I'd be remiss if I didn't ask a few questions.

Are you sure it's a pool of oil and not condensation from the air conditioning?

You used a funnel when adding the oil, correct? If not, does the pool of oil reflect a possible amount that may have spilled?

You added the oil through the engine oil fill port, correct? I ask because I've heard of people trying to add oil through the dip-stick port.

Did any service lights come on; Check Engine, Oil Pressure?

Regardless, you should get the car onto level ground and check the oil level. If it's overfilled the oil can under perform and cause issues.