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I had an implentation dip at 5 dpo checked my cervix and had IB also so I guess it was the start of something for me. But it's very unusual to be that early. Are you defiant on your dates?

In saying that though I did get a positive test until 11 dpo and even then it was faint I wouldn't early test. I am one who does but it can bring about a lot of heartache if you see a faint line then start af - chemical pregnancy I think sometimes it's better not to knoe

I gotten faint positives earlier, but I recommend trying to wait until 12dpo to test. Otherwise you might drive yourself crazy worrying if they're faint positive's or evaps.

implantation on 4-5 dpo is not possible; the embryo must get to a hatching blastocyst stage before implanting, and get to the uterus, and this does not happen before 6 dpo. on 4 dpo it is still in the tubes.
usually the implantation begins 6-10 dpo
the earliest one can get a positive is 3-4 days after the beginning of the implantation, with a sensitive test
i had my first bfp on 12 dpo

My chart looked 'off' this cycle. BBT shows that I ovulated on cd 12, I had a dip at '4 dpo' and another dip at '9 dpo'. I also didn't have a +opk until '4 dpo' according to fertility friend's chart. I'm thinking that '4 dpo' was my actual ovulation dip.. ALSO, I had 2 very faint bfp's yesterday at '11 dpo'. FX for a darker BFP! Which, if I'm right about the dates, the faint bfp would actually be 7 dpo.. Would that even be possible? Extremely confused!