Faint +, then - and now pink discharge TMI, please help!!!

I was scheduled for my period on Oct 26-30. Prior to, my husband and I were trying to conceive in the month of October. Had a few symptoms but nothing major.

Oct 25: experienced some light pink discharge (this was new to me) and the day my period was due (26th) I took a pregnancy test and got a faint positive and later that day I bled, only bled for 3 days vs my normal 5 days, it was a really light period? If it was a period.

Oct 31 (this morning): took another test but it came back negative so I’m pretty confused. I posted this in the other group (Faint positives)

Later today:

But after posting and comments said it was a chemical... which brought me to tears I proceeded with my day.... just got back from the 🚽 and I wiped and there was pink as well as brown discharge AGAIN! Can someone please shed light on what is going on with my body.