I am 52 years old, had my tubes tied 23 years ago, but I have missed two menstrual cycles, could I be pregnant, I have had a lot of nausea lately, and last week I vomited twice, or could I just be going through menopause, am not having any of these hot flashes that women keep telling me about, but am having signs like when I was pregnant before, very concerned about this, what should I do, have not seen a doctor yet. and feel silly about buying a pregnancy test.