Thanks to the implant nexplanon I had finally started having regular periods. My cycle is always 28 days long since about the 3rd month in to having it. I'm now 2 and a half years in and for the first time ever I have missed my period. I had a little spotting a few days ago but no full blown period like I've always had. I've done tests and got very clear negatives so don't think it's pregnancy. What could be stopping me coming on? Understandably I am worried as I've had no problems up until this month