On the 15th I spotted while attempting to have a bowel movement. My menstrual cycle was supposed to start on the 18th but it didn't. On the 19th I had spotting on the 20th I had light bleeding with small clots. On the 21st it stopped completely. Today the 22nd while trying to have a bowel movement I started spotting again. I am trying to conceive and took several home pregnancy test which all where negative. What could this be? I researched it online and had several different responses.