How long does progesterone throw your period off?

Last month I was put on progesterone which made my period late by 3 days.. well now I’m late again by 3 days this month!! and I refuse to take a pregnancy test because I don’t wanna get my hopes up because I took a test the day before my period was supposed to start and it was negative.. so if it is the progesterone still messing with my body how long till my cycle is back to normal?