Hi, I am 39, my period is late by 2 days. I have all the symptoms of getting it except I also have like a heavy head feeling. I used to be 28 day cycle but last month was 35 days fir first time. Last month i dI d several pregnancy tests between days 28 and 35 and all negative. I had sex on day 12 this month. Iam not on any medication, have not lost any weight or carried out excessive exercise, same lifestyle as before. Any clues as to what is going on. Lucy