Happened to me but only missed it for two days and period came and mind you that has never happened to me. Before then I thought I was pregnant and kept getting negative tests
But if I were you I’d go for blood work to confirm
I’d check up with your doctor to run some tests… it’s possible that you haven’t been ovulating so there could be a hormonal thing going on or you may have PCOS. This happened to me last year and that’s when they diagnosed me with PCOS and put me on metformin… I hope everything works out for you :)