Im very regular on my periods nevrr late never misd a month so my last period was June missed my July 27th period took a hpt Aug 3rd negative started spotting Aug 7th light pink when I use the restroom had intercourse Aug. 8th and 9th after that. Spotting was red turnd to brow took a hpt Friday Aug 10th which I don't think I got enough urine but that test said negative I've been feeling nauseous, having headaches and backaches but no period, but why am I spotting now without a period and getting negative hpt results? Cud I be pregnant or could it jux be an irregular period fa me?