4days late.. when do i test

last month i got my AF on the 13th .. i was due on the 10th ... recently i'v been getting my AF on the day its due giving me a 28days cycle ,.. im now 4days late.... the odd time during the day i think its coming but i had unprotected sex on the 17th 18th 23rd 24th 25th and the 28th in november. i took a test on 10th of november the day i was due but it was negative ... when would it be better to test to see if i am ..

[Clysta]

Anytime after you're late you can test. Make sure to use first morning urine.