??? unknown bleeding ???

i have a 28 day cycle, starts on the same day every month and ends on the same day. very normal cycle. i was set to ovulate on august 16 or 17. my boyfriend and i had unprotected sex on august 14&15. he pulled out but i believe he hadn’t pulled out in time once.

the next day, when i was set to ovulate, i had very heavy clear discharge with brown and pink blood tint. it was heavy and it went on for a few days. then it stopped.

overall, i started cramping, having pretty significant spurts of heartburn and nausea. i had a feeling that i was pregnant, just a very strong feeling.

closer to my period, my cm did not change how it usually did. it always would dry more and just stay until i got my period. but i continued to discharge and it was watery and clear and somehow also thick and milky colored. it was not normal at all.

on saturday 9/30, i took a test and it came out negative (which i recently learned it could have been too early, or too light for me to notice)

i was supposed to get my period on the 1st. i did not. and my cm continued to be off. i felt off also.

just a few minutes ago, after being almost 3 days late, i got what i thought was my period. it was a a flow of blood that i got out of nowhere. but when i wiped it away, it didn’t bleed anymore. and the darkest part, it looked like the sticky cm you would get during ovulation. and then it lightened significantly after the first initial cleaning. then, it was tinted red and watery until it dried and now my cm is clear and watery. all in a span of 5-10 minutes.

im very worried. i personally do want to be pregnant and when i started bleeding it was so upsetting but now i’m not bleeding at all. i’m so confused as to why i’m bleeding. can someone please help? if it was my period coming it would have been very heavy and i would still be bleeding but i am not. does anyone know what it ciuld have possibly been?