5 days late BFN

How long did it take you to get a positive? I have a 28-30 day cycle and it's pretty much like clockwork. I am now on cycle day 35. My husband and I have been trying for almost 3 years and I always get pms symptoms a couple days before I start, but this time I have NONE. Not even tender breasts or cramps. Idk what's going on.. Looking at all of my past cycles, the last time I had a cycle past 31 days was over 2 years ago.