I tested a lot! I tested 8 dpo and 10 dpo and both were negative so I was disheartened at that point and definately felt AF coming on. Then on a whim I did a Opk from my clear blue easy fertility monitor and it was sort of positive and I thought wow thats weird (because I never show any LH when not ovulating). Next morning decided to break down and use my last first response Hpt, and at is when I got my BFP, 12 dpo!
Only symptoms I had was a bit of cramping and vivid dreams. I think implantation feels like mild af cramps. Like I said, I honestly thought the witch was coming!
Also one other thing, I checked my cervix just once during the later half of the TWW and it was high, soft, and closed. This is the only time I have ever checked it so don't know it that is a sign or not. Hope this helps.