I am 41 years last LMP was on July 24th. Thereafter had sex on 8th day but partner withdrew before ejacualtion. Have missed my period in August. Did a home pregnancy test but was -ve. Thereafter had meprate for 5 days (2tablets daily), but no bleeding. I have pain in my lower stomach regularly as if the periods are going to start. Please help

If you do not have the next month period, time to see the doctor. Too many factors possible.