i had unprotected sex with her on 7th , she took ipill just an hour later

Patient: Hello doctor,i and my gf both are 22 year old and were virgins when i had unprotected sex with her on 7th , she took ipill just an hour later .she was supposed to get her periods around 8th but its been 3 days and she still did not get her period . we are both worried , do we need to do a pregnancy test .

Doctor: