Nexplanon birth control implant

Demi • Baby #1 is now 3 & my best friend. Baby #2 is baking in my tummy 😻
I've heard stories that if the implant is put in wrong, you can still get pregnant. My implant is moving lower and lower down my arm. I was bleeding every day of the month with maybe 3-5 days off it. Now I'm experiencing brown spotting. I don't know what's going on but does anyone have similar stories? I'm going to get my implant removed soon btw.