7 day late period as we speak....

I have always been on time... ALWAYS!! I'm 32 and have regular 30-33 day cycles, periods lasting 5 days. I got my period in march 14, April 12 and may 12. June....NOTHING!! I have cramping, I took FIVE tests and they were negative!! I don't suffer from irregular periods, I may miss 2-3 days if that but then it would come. This is the longest ever except for when I got pregnant with my sons 12 & 7 years ago. Has this happened to anyone?? Been regular and all of a sudden, ur period was late but then it eventually arrived?? I have a doctor appt at 5 today. Plz help.