Stamp

Does anybody know about entry and exit visa stamps?

I am European. I came into Uruguay, from Brazil, a couple of days  by car. But I neither have an exit stamp from Brazil or an entry stamp into Uruguay!

I am planning to fly to Europe in a couple of days. Does anybody know what problems I will face when I try to leave? Is there a fine to pay? Or other problems to resolve?

Thanks in advance for any advice.