Have you experience this with your cycle then got a BFP?? Plz help!!?!

Carrie
Ok so I started having light bleeding with some with mucus stuff attached on CD26 11dpo very light on and off throught the day. I tested at 10dpo got a bfn and test 11dpo still a bfn so this am at 12dpo I deside to test with FMU TMI- so I good to pee in a cup as well as the rest in the toilet to see there's a lot more blood then yesterday thinking its AF (note doesn't seem like a period) in the toilet is about a size of a Nickel that is dark blood when pulled apart its that stretchy mucus stuff. Any ideas of the is AF or still implantation ??? (Don't start AF until the 19th) also I did put in a tampon just in cause AF came early but when too it out there was very lil on the tampon brown blood and bright red. If anyone has had or is having this experience and later got a BFP please comment and let me know my body is driving my nuts this last weeks ! Also hope long you implanation last ? What Dpo did you get your BFP?