Hello, My menstrual cycle was supposed to be due on Oct. 20th. It is now 13 days late. I ve had light cramping though, along with tender breasts, headaches, and fatigue. I usually experience these symptoms when my cycle normally comes anyway. But recently I ve experienced frequent urination and even excessive burping. I ve taken both a home pregnancy test and gone to the hospital to have a urine and blood test done. All came out negative. The doctor I spoke to said it may be too early to detect pregnancy, but also that it may be a hosts of other things effecting my cycle. Lastly, do all women experience implantation bleeding?