Should i start worrying ?

I've had a PCOS Diagnosed 2 yrs back and had been on medications since. The medications have done its job and fixed my cycle patterns and touchwood i've been having proper 31 days cycle, in the past it was irregular. I've tried all ormone tablets and jabs available in the process.I've had a hystereosalpingogram (HSG) done last mth rite after my period cycle and i am abt 2 weeks delayed now for the first time in 18 mths. I did a test at the docs on the 3rd day my periods was overdue, the test showed negative. I was told that it could be 2 things...its either that i was not pregnant or my hormone's were too weak to show just yet and was advised to check after 2 weeks atleast. NOw tell me ppl, should i start worrying and go see my doctor or what?? I am worried, everyone keeps saying that take it easy if its meant to be it will be. Dont think abt it..How can u not, its not an external hardisk that u can just forget abt it n not worry, is it???? HELP!!!!