Thoughts on this?

Was negative at the 3 min mark- but darker later on.. I’m 10 DPO - haven’t been tracking all symptoms perfectly but did the deed a few times in predicted fertile window as well as predicted OV day- been crampy and nauseous on and off last few days .. not sure if this is evap which is popular with these tests these days as I’ve been reading. (I used them to test for my daughter and my son.. son is 6 now lol) i have another one I’ll test with in the morning but was wondering what you all think? AF is due Monday