I am 41 years old, been married 7 years to man who had a vasectomy 10 years ago. No other sexual partners. The last period I had was 2 weeks late but then when came was pretty normal. I am now 41 days from last start of period. I have felt over the last couple days that I am gonna start, but nothing as of yet. One other wierd thing, the last week, at night, I have had cold spells where I just couldn't seem to get warm. Is this normal perimenopausal behavior or something more I should worry about?