could i be pregnant?

i had a baby 9/17

on 10/31 i had unprotected sex

on 11/1 i took a plan b

on 11/2 i got a birth control implant

on 11/8 i had sex where he finished in me (implant effective on 11/9)

from 11/12-11/21 i had brown spotting

since then i’ve been having sex where he’s finished in me but my period is over a week late

what do you think?