I Had My Mirena Iud Removed 7/19. Since Then Ive

I had my mirena iud removed 7/19. Since then ive had some light pink spotting on August 4th and 5th. Today is September 2nd and i have not started my period or even feel like it is coming. Are my hormones that out of wack from having Mirena for 3 years, no period for 2 years or could i be pregnant and how am i supposed to know when to take a home pregnancy test?