I noticed oil in a puddle when parked

A week and a half ago I changed my oil myself. Its been a few years since I did this. A bit spilled when I was fiilling. Since then Ive done maybe a couple hours of city drivng. This eveningI parked over a puddle and noticed an oil slick. Maybe 5 feet by 3 feet in size. I moved to a different puddle, oil slick again.

I have a two hour drive to the coast tomorrow. I want to make sure everythings ok before that. Is there anything I should do before leaving? Should I stop every half hour to check the oil?

Its a 2000 chevy express van 5.0l