A little insight or a peace of mind?

I started spotting on the 9th which was pink, on the 10th I spotted red and on the 11th I spotted stringy gooey black stuff that disgustingly looked like it should've came from the other end with no odor or itch. Boobs we're a little sore but now nothing. Only time I ever have spotted I was pregnant or miscarring. I'm just a little confused. I took 4 test which were negative and by now I should be 12dpo. Any insight? Btw I took 300mg progesterone starting the day after ovulation for low progesterone.