Has this happened to anyone else?

I haven't been feeling like myself lately and thought some of the 'symptoms' were a sign of pregnancy. I took an at home test that faintly came out positive then a minute later shows negative. It's happened twice already and I'm not looking at the test till its time to. I'm confused about it. Has anyone else had this experience? Should I get a blood test and if I do could the results be just as unsure?