Hi, I understand your concern. Two months delayed period with repeated pregnancy tests being constsntly -ve is a point of concern. * first of all you should get blood HCG test/ sonography to confirm pregnancy test reports. * Delayed periods with -ve pregnancy test indicates some problem with menstrual cycle .It can be due to- post illness irregularity, sever anemia, hormonal imbalance, PCOD or other ovarian problems, thyroid problems. Feeling of nausea / metallic taste in mouth can be due to GI disturbances/ hormonal disturbance. * If your pregnancy is excluded , you should consult a gynecologist, get physically examined. Doctor then would advise investigations ( like CBC, Thyroid function test, USG abdomen, hormonal assay)- to pin point the cause & then would advise specific treatment to regularize your menses. Thanks.