M.G.
So you're 45 years old and your period is a week late?
Women my age are irregular - I'm slightly older, but from your age and older, this happened to us. We entered peri-menopause.
Unless you had unprotected sex, I would not be concerned personally - especially if I took a pregnancy test and it was negative.
Feeling tired - my friends and I feel that way at our age. I have very oily skin that started around your age. It's from hormones.
Every woman is different. Go see your doctor and ask her/him these questions. I am not sure why you'd think any of us can tell you if you're pregnant. You haven't actually asked a question here so I'm wondering what you are asking.