I’m late... but got to BFNs

My last period was 9.3.17 had sex multiple times during the time I should have been ovulating. My periods was suppose to start on 10.5.17. I’ve been cramping off and on for the past week and half. I’ve taken 2 test one two days before AF was due, second was the day my AF was suppose to start. Should I test again now or wait a few more days??