My cycles are usually between 28-30 days. I had a period April 21st, and then again May 19. So I should have started again around the 16th or 17th of June. SO I am on CD 33 which makes me around 4 days late. I took a generic blue dye test that is supposed to be comparible to FRER. Within 2 mins there was a light blue line. Which later then turned to a dark blue line. But then this evening I took a real FRER and it was negative. Any ideas.??