I have only worked in Canada for three months. Can I get a tourist visa to America?

Indeed, because you have just entered Canada for three months, you are not very stable, you are easily rejected, you are suspected of immigration tendency, and your success rate is very low. You can cancel the appointment and wait until half a year later. Although the money will not be refunded to you, you don't have to pay for the next appointment. It is safer to use money directly this time, and it also saves the next 160. And if there is a refusal record, the application will have some influence in the future.