Is this normal?

I am 11 DPO, I have gotten bfn this am. Af is due to come tomorrow but sometimes can vary about a day. Normally when I start it’s brown discharge and then by day too it’s pink to red and heavy. I just wiped and noticed a little bit of pink, and then I took a took tp and poked it up there a little bit just to see if it was darker, it was a lot more pink and a little bit more discharge. Small spots tho not covering the whole tissue. But not like blood, or brown discharge which I normally get starting my period. My boobs are very sore, like my muscles are very sore in my boobs. I feel nauseous at times. Could this be implantation bleeding? Also I’m still cramping and my back is killing me. But I did ovulate late, approximately cycle day 18. Anyone else go through this and end up with a big fat positive?