Negative tests

I have a super regular period. I am never late. But I am now 7 days late but my tests say I'm not pregnant. For some reason I am positive I am preggers but I so scared of being heart broken... my hubbie keeps telling me "if it happens it happens, if not we will try again" but I don't think he realizes how hard it is just to ignore it. It sounds weird but every time I go to the bathroom I dread seeing blood. And with all the random symptoms I have been having. (And trust me trying to debunk) I am sure I am pregnant. Why am I not getting a positive? I just want to know for sure... I hate waiting...