Clear blue positive then disappeared

[Boymum2256]

So I done an ultra early clear blue today at 8-9dpo I had a very faint positive after 3 minutes and in the 10 minutes time frame then after that it disappeared anyone else had this before?

Hey OP, answering so you don't go unanswered but I don't have any experience of this happening. You may get better responses on the conception boards but also a search on these clear blue tests may give you a quick answer. They're not great for evaps so maybe worth trying with a pink dye test?