Hello, I'm 41 yrs old and am 2 months late on my period. I have some lower back pain, feel a little lightheaded, and
A little sick to my stomach. I know I'm not pregnant. Help please I'm scaried! Thanks DEE

Why do you know you are not pregnant, ( I will assume you have not had any sex at all ( no form of birth control is 100 percent,)

It could be many different things, have you considered seeing your doctor for an exam