Period 4 days late,negative test... could be pregnant? Has this happened to you??

Glo Girls!!! I am 31 with 4 kids from a previous marriage. When pregnant with them, I missed my period, took a test, and it was positive. It's been 8 years since my last children and my current spouse and myself have been trying for two years. Every months, my period comes like clockwork, and if it doesn't, it's early. But not this month.. I'm 4 days late! I took a test 3 days ago but it was negative... Aunt Flo still hasn't come and I want to get excited but the test said I wasn't. Because it didn't happen with ANY of my other kids, I'm having a hard time with the false negative idea.... Have any of you had false negatives?? When did you get a positive result??