Hi  im 45 going 46,my last period came last feb 19-20 just 2 days after nothing  ,i had sex march 12 and march 18 ,i just wanna know is it coz i ve used birth control pills ..about 3-4 months and i switch other brand in 5th pack then i stop ..i check pregnancy test just yesterday it was negative so is it possible im pregnant?or menopause ?please help