Spotting and pregnancy test?

I just took this , looks like a vvfl BUT I read somewhere that blood can cause a false positive and protein... has anyone been pregnant and took a test while spotting? I was spotting most of the time with my last pregnancy that ended in a miscarriage... advice?? Thanks(: 
UPDATE!!
Just took this this morning 😀 I took two of these last week because I felt off and was told it was negative which they were vvvvfl so I'm in shock a little especially for this being two years and two miscarriages later😭