Going by just one measure - which is never good enough - if you have a perfect cycle - which only you would know - your ovulation dates are 14 days after 5th which is roughly 19th . So say 17th - 22 would have been the right days to have sex - you did on 17th - maybe the egg was not ready by then - the result after 10 days says negative - so then that's the final. Please chart your dates better and try a number of times... its hardly a one time situation and may takes many attempts and many months so please, be patient. https://lovematters.in/en/our-bodies/ovulation-calendar-how-to-calculate-ovulation If you would like to join in on a further discussion on this topic, join our discussion board, "Just Ask” https://lovematters.in/en/forum