Implantation on CD 25?

I think I had implantation bleeding on Monday (CD 25) because that whole day I had cramps and then I thought my period was coming early except it was just one spot of pinkish discharge and then nothing else since then except creamy CM. I am due for my period today and still nothing. I took a dollar tree test that came out negative but not with FMU. I tested on Tuesday (CD 26) and thought I saw a faint line but it might have been an evap line. If I had implantation bleeding on CD 25 how long before I got a BFP?