When should I take a home pregnancy test?

Natalie
I am irregular on my period and trying to conceive. My two last periods were 04/20/2017 lasted 6 days and the next one was 05/25/2017 lasted 6 days... My periods had always been in between 35 to 40 days and ones in a while up to 45 days... I have many early pregnancy symptoms, but scare to bring my hopes up... When should I test?