Could i get tested for sti within the first week of having sex with someone who has a sti? chymdia

Partially: You could be tested for Chlamydia, but persons with one STD have a high likelihood of having more than one, and testing for others may not be of value until more time has passed. None-the-less it would be a very good idea to be seen in an STD clinic or in the office of a knowledgeable doctor and followed appropriately. Do not neglect this. Better safe than sorry. Good luck.