Missed period on the pill

Tara

Been on the same birth control pill for 9 and a half years never messed up, me and my husband don’t use condoms we have 2 kids 13 and 9 not interested in anymore August I had an abnormally long period then September 2 days of spotting and this month nothing yet app says I’m 2 days late.. and have had severe back pain for about 3-4 months what is happening lol have taken multiple tests because my anxiety gets me but all negative and I have no pregnancy symptoms anyway is the pill just making my period none existing