12 days late, but negative pregnancy test

Mikea • 29 yr old mother of 6 👦🏾👧🏽👼🏽👼🏽👼🏽👶🏽. Breast cancer cure supporter 💞
Good evening ladies. 
Soo about a month ago I had my Implanon removed. My period was due on November 6th and I'm 12 days late. I have taken several pregnancy test including one yesterday and they all said negative. I've had frequent headaches, lower back pain, & white, creamy discharge (more than usual). Could I possibly need to get a blood test done or not even worry about it due to the Implanon being removed.