kinda losing hope now )): help??? has this happened to y

T
So I took a dollar tree test , it was positive this morning... & a lady said she had a positive on one and then took a true response one & it was neg )): has this happened to anyone else? I took a test a few days ago and it said neg but I was also really early in currently 11DPO. I don't even wanna take the expensive test just Bc I have a bad feeling it'll say neg. On the good side, my boyfriend said my nipples are 2X darker , Ive been bloated for like a week now & I had a lot of discharge for over a week.