Any errors on FRER?

So I took a test last night and got a faint line. I wake up this morning and tested again and got an even fainter line. First thought I think I might of urinated to much on it. After I did I noticed the control panel showed the solid line get a little blurry and then cleared up. I did drink cranberry and water last night so I was thinking would this matter and maybe the hcg was diluted? I read a lot of websites this morning saying it doesn't matter even if there's a faint line if it's positive, then it's positive  nd it doesn't matter when you test but FMU is recommended. I'm 9DPO and I'm still feeling cramps here and there. I get these sharp little twinges of pain mostly on left sometimes in my right now I'm getting it in the middle of my uterus. My boobs feel fuller and are little sore. I cried so much yesterday. Has anybody experience similar to me? I would like to know. I want to stay optimistic and think there is still a chance and not think about a chemical pregnancy or false -/+