So i was pregnant last year and miscarried at 6 weeks 3 days. Since then ive had my cycles every 5 weeks. Glow has been pretty accurate.. anyways im now 10 days late and took tests on days 7, 8, and 9. All negative.. i do have pcos, but i lost a lot of weight and havent had issues in over 2 years with my cycles.. im not under any more stress than normal. My breast hurt and emotional and get easily upset, but those are all symptoms i get right before i start my cycle. What do you think it could be..