IMPLANTATION BLEEDING?

Hey ladies, so I am TTC Month 1.

My boobs have been killing me since last Friday, 3 DPO, and they have been so big. I have taken 2 first response tests and 1 equate digital test and all three BFN.

I am on 11 DPO today and I have had a terrible headache all morning along with insane cramps and lower back pain. I also had some clearish brown discharge today so I put a pad on bc I thought AF was coming. I went to the bathroom again a few hours after and when I wiped I have just a little bit more brown discharge on the tissue and some on my pad. Still super crappy, but hoping this is implantation bleeding.

Let me know if this looks similar to what you may have had.