Late period

I was due for a period on July 4th, I am a 28 day cycle worth a period that last 6 days. I know my body and I'm never late. I don't even show signs of a period coming no pink no spotting nothing. I've been trying for 10 years and in 2011 had a horrible ectopic pregnancy. What do I do. I took a test last night, NEGATIVE I'm only 7 days late, is there hope really.