Took home pregnancy test not pregnant but missed period and it feels like I'm about to miss this months as well, no sexual intercourse after test.

See below. Menstrual irregularities are not uncommon. Anovulatory cycles are one cause. If you miss more than two periods it would be time to see your doctor. You may wish to consult this site for more information. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/pages/causes.aspx.