What is my uterus doing?

Sally

At cycle day 15 I had some spotting, and it lasted till cycle day 17. I was thinking it was ovulation spotting and we baby danced accordingly. Now, a week later (cycle day 22) I have had some blood streaked, sticky cm and very very sore boobs and nipples. My cycles are generally between 30-35 days so this all feels v early and I don’t know if I should get my hopes up! Thoughts?