I need advice, are these pregnancy symptoms?? May be TMI.

So, I've taken a pregnancy test every day for the past 4 days and all of them are BFN's. My test today acted like it wanted to be positive but the faint line disappeared. (it wasn't just line eyes, my fiance saw it too) I am 11 dpo today. My nipples have been VERY sensitive the past few days. They have this numb tingle, and I have to wear a bra at all times because they're too sensitive for the air to hit them. And my areolas are puffy and my breast feel more full, but they don't hurt. I had this very light but constant dull crap right above my pubic area and it was there for 2 days straight. And yesterday I would get light pinches in my back. I am so very tired... ALL the time. Could I be pregnant?