How many of you had a negative hpt but ended up pregnant?

Andrea
I am on CD 40, never been this late ever in December I got my AF on CD 38 then it regulated back to 30 days... Took a test Friday the 27 and it was negative but I still had no cramps or any other symptoms I have before I get my AF... How much longer should I wait to call my doctor or am I just missing a period even though I never have before ? I don't get it 😞