I am 41 and a had tubal ligation back in 1996 and have never missed a period since then.. I am like clockwork with every 28 days. I had unprotected sex on 10/22/14. My period in October started on 10/8 which put me ovulating and fertile on the day I had sex. I started my next period on Nov 4. First day was extremely weird with light brownish not like old blood . This only happen on the day I started then it stopped and I started to bleed a two days latter which was very light .. Don't remember any clots or heavy bleeding..I am now 13 days late for this months period .. Mild cramping , bloated, tired and breast feel heavier but don't hurt , headaches today as well as stuffy nose ... 5 negatives of test so I don't know what's wrong ,, just feel like crying ..because I don't know what's going on with my body .. Please any help is appreciated