Hi! I Had Sex Recently Unprotected And I Took A

Hi! I had sex recently unprotected and I took a morning after pill the very next morning, within 10 hours of the encounter. 8 days later I started getting a brownish discharge so far it's been going on three days. Does this mean I'm pregnant? Or is this a symptom of the pill? I was going to buy a pregnancy test but I don't want to waste money if I don't have to