Instruct: Classify Amazon reviews into positive or negative sentiment
Query: False Positive!!

I just finished my first IVF and bought these tests to see if it had worked and if I was pregnant. Imagine the emotional roller coaster ride... the first test on Sunday came out negative. I did the test again Monday morning with first urine and it came back "PREGNANT"- I was thrilled and convinced that the IVF had worked. Then, I went down to my Dr. at Stanford to go get a blood test to confirm and while there, started my period. What an incredible let down. I thought this thing was supposed to be ACCURATE! What a waste of money... best to always go get blood pregnancy test done. I will never make that mistake again. The pain of thinking you are pregnancy because of this idiot device and yet finding out that you aren't.. too much.