Confused - negative pregnancy test

Kate

My husband and I have been TTC for 5 months now. I did an OPK during my last ovulation. I have never missed a period, ever. I am 2 days late now and have gotten 2 negative pregnancy tests. I have a number of pregnancy symptoms - fatigue, dry skin and scalp, frequent urination, tightness in my abdomen, increase in thicker CM, moodiness. I just don’t understand what’s going on?!