My dog swallowed a plum seed!?

My shih tzu dog, almost 2 years old has swallowed a plum pit whole, that is about one inch long and 2/3 inch wide. My dog is about 8-9 lbs and she has been vomiting a few times, but has stopped. She seems pretty normal except a bit tired and she did go poo, but there was no sign of a plum pit. I am very worried because she is a small dog and I am afraid if it will get lodged in her intestines. Please tell me if I should visit a vet immediately or wait for a couple more days to see what happens. I am worried if my dog has to go through surgery, so please tell me if there are other ways to get the seed out of her system other than surgery.