My period is late 5 days.. at the day of and 2 days passed missed period I saw a negative..

Do you guys think I should be concerned? Or should I test tomorrow to confirm??

I don’t know what possibilities might give that late of a period...

I used to get a range of 32-36 cycle days after my miscarriage (9 months ago), but last month for the first time after having a miscarriage it was 29 days!