My last period started Aug 1 lasted 4 days

Tara
My last period started Aug 1 lasted 4 days. On Aug 16 I felt like my period was coming. I went to the bathroom and seen some pink blood. Cramps stopped later that night. My period was due on Saturday. Well it never came. I took a test today and came back positive. So I guess that was implanted blood I seen on Aug 16.