at 45 i lonst my period for 2 weeks pregnancy?

You may be, but you mention no other symptoms. You may also be entering a life change, otherwise known as the menopause. Or you may simply have missed your period, in the sense that it is delayed for some reason.

I would encourage you to read about the life change so that you can better understand what to expect, and if you have any concern regarding pregnancy, to visit a doctor or clinic.