Call your normal vet Monday and let them know what happened. Internal parasites can cause diarrhea, you should be able to take a fecal sample into your vet for testing. It is not expensive and alot of times if you’re animal has been to the vet before and you provide them with the poo and the gram weight of you animal they can call you with results and a prescription if needed.

The next time your snake poops bag it in a Ziploc and put it in the fridge until you can take it to the vet. This will preserve the poo so you get an accurate test result.