pregnant or not

Hey everyone, just a quick question. I had my Implanon removed about 2 months ago. At first, I used the Nuva Ring for a week, but it didn't work for me (since we wanted to wait a bit longer). But now we're ready to go for it, and here's the thing... I had my period from Oct 6 to Oct 9. Then I got my next period exactly 3 weeks later, from Oct 27 to Oct 31. Now, 3 weeks later, I should have gotten my period yesterday, but it didn't happen. My pregnancy test was negative. Does anyone have experience with this, or will my period just come eventually?