2 weeks late and still getting BFN

Hi, I'm looking for some advise. My period is 2 weeks late gone Wednesday, no sign of it coming and I've had 2 negative tests. My period is always like clock work and if I ever have been late (which is very rare) it has been no more than 2 days. I have no other indications, such as tender boobs etc which thinking about it I normally get the week before my period is due, and havnt this time. I am driving myself round the bend as I am so hoping the end result is a positive and the more time that passes the more I can't help but get my hopes up, but at the moment I just want to know either way as being in limbo is driving me insane. Can anyone give me any advise please?