4 days late + pink discharge

hello all!

i’m currently 4 days late on my period; i always feel like its coming, but it never does every time i rush to the restroom. i keep getting pink discharge but not every time i go as well. alongside this, i’ve been having severe back pain, cramps, and nausea. is it possible i’m pregnant? or could my period be on the way, just late. last time i had sex was february 9th, unprotected. pe

the only reason i am asking is because the window between the time i had sex and now seems too small?