Highly suspect I implanted on 5 dpo and on 9 dpo I had some light brown cm (old blood tinged cm), and 10 dpo a teensie bit more. I first tested on 12 dpo and it was an incredibly faint positive (no pee hold, 25 miu test), and 13 dpo it was a faint positive (no pee hold, 25 miu test). Next day positive digital, and the days after that dark lines on 25 miu. Never held pee bc I wasn't sleeping/was really sick.