Not sure what to do next...

My husband and I have been trying for a few months now and right now I’m three or 4 days late. This is not a huge deal other than the fact that every test I’ve taken in the last week have come back negative! At this point I’m just getting more and more frustrated and it’s stressing me out. Which could be why I’m late to begin with, not because I’m pregnant, but because I’m stressing myself out. I would call my doctor to get a blood test but I figure I will do that and then start my period or I’ll get the test done and then start my period and I’ve just wasted time and money. I’m just at a loss.