7 days late with neg test... still a chance??

Elizabeth

So this month I have had my longest cycle ever!!! I am on day 37 and my longest cycle was 30 days but that's only happened twice in my life. (Usually very regular) I've had two negative tests. (One day of my period and the other a day ago) My Doctor told me to week again then test again. Has the happened to anyone then later got a positive test??