Was around someone with the flu a couple days ago. its been over 48 hours since ive been in contact w them. when will i know if i got it ?

Probably OK now but:: The average time it takes to develop flu symptoms is 2 days but it can take up to 4 days so it is still possible you will get it- see https://www.cdc.gov/flu/professionals/acip/clinical.htm But you do not have to wait passively to see if you will get it; there are steps you can take now to boost your immune system such as taking Vitamins C, D and Astragalus. See https://tinyurl.com/zeccbso