Mastitis or am I pregnant ??

So we are ttc #2 and I’m on dpo 8... my boobs have been really sore but the right one more then the left one.. yesterday my right boob wasn’t sore anymore I’m in pain!!! Like I can’t even touch my boob.. it’s not hard or anything just super painful to the touch!!

I did take a dollar tree test this morning with FMU and it was BFN

But then I took a Frer later on and I see a line..

You guys think Mastitis or just sore cuz I’m actually pregnant??