When should I re-test?

Hey ya'll. So my husband and I had sex on Feb. 19th & he ejaculated inside me. Well, my period is normally spot on. Very rarely will it start after when it's supposed to be here. (When this happens it usually starts the next day) i took a test the day it was supposed to be here & it came back negative. Should I re-test soon, or just wait it out? I am now 5 days late. Thanks everyone. <3