Could I be pregnant?

so af was supposed to start on the 3rd of Sep but I've had no signs of af and I'm very regular 32 days. I've taken a few test all BFN. Not really having any preg signs either other than I'm extremely nauseas and have bad indigestion, mild back ache, and some cramping on one side. should I wait a few days to test again or is af just late this month?