Period 5 days late

Hi everyone i had an etopic 4 years ago jst started trying again 7 months now my periods are between 28 days and 30 im 5 days late now going on 6 i took a pregnancy test its negative if i was pregnant even if ectopic surely it would show on the pregnancy test i had my right tube removed im so worried dont know whats going on i havent been <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> has this happened to anyone thanks adivce welcome xxx