day 2 no period

Brittany
I was suppose to start my period yesterday which I thought I was I woke up with really bad lower back pain, nothing else just the back pain! Again today nothing but lower back pain... I am 12 DPO and took a test on April 24th and it was negative! Should I wait few more days and see if my period comes or go ahead  and take a test? Me and my husband are trying to conceive! Hoping and praying to be pregnant