PMS or Pregnant

Laura
I don't know if I'm PMSing or if I'm pregnant. I got my nexplanon implant removed the 9th of August. I still haven't received my period but for the last week my boobs have been really really sore. At first it didn't bother me but it's to the point it almost has me in tears. My stomach feels WIERD but I'm not cramping. I've taking pregnancy test but I haven't got a positive. I have no idea what my body is doing. After I got my first implant taken out I started my period within a week.