when to test after unprotected sex

-last period january 9th
-Unprotected sex on January 29th
-He pulled out.... kinda
-Usual cycle 21 days -- never late... until now 😱
Is there a chance of pregnancy?
If there is, when should I test?
I am just wondering because i wouldve ovulated super late which i am not sure if that is possible??
i appreciate anyones answers in advance xx 
also this is my first time posting and i have no idea where to put this and i know questions like these get asked literally all the time. sowwy 😭😭😭😭