I have fairly regular periods (usually about 31-33 day cycle). I had a period on 14th June so (foolishly) looked out for it on 14th July... still waiting!! I went straight on holiday after the school break which was very relaxing but took a test after being 17 days late. It was negative but there is still no sign - I have had regular period pains but still nothing. I;ve never had this before! PLease advise!