Pregnant on nexplanon?

Al
Have any of you ladies ever fallen pregnant on the nexplanon implant? Ive had it in for about 8 months and for the past 2 months or so ive been having textbook pregnancy symptoms along with no period (which could also be caused by the nexplanon) I took a test that came back negative a few weeks ago but I'm just reading now that nexplanon causes false negatives. Should I be worried?