A lot of white smoke from exhaust?

Hello,

I went to work at noon today and I did not notice anything amiss. When I left work at 7 PM, though, a lot of white smoke came from my exhaust when I started the car, and it did not go away immediately. I thought it had a slight oil smell. I had no choice but to drive it home, which is ten minutes away. As I drove, I could no longer see the smoke, although it was pretty dark by then. I did not feel or hear anything unusual as I drove, and I made it back to my house without overt issues. When I got home, I looked under the hood with a flashlight, and I saw nothing unusual, and I could not smell anything off. I did not check the oil since I wanted to let the engine cool down from driving. There were no warning lights on my dash. I will take it to the shop tomorrow morning, but I am worried that there might be a serious problem that I do not have the money to fix.