Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not a good product

The ovulation tests are not good. It's not the Wondfo brand. The result is not clear. I test it the day after my ovulation day, it will show a faint line in the first 2 minutes, then it turns darker after 2 minutes, and a little later, it turns as dark as the control line. At the same time, I use the brand that I got from earlypregnancytest.com, it shows a faint line and after 5 minute, the line color still maintains the same; which shows that I have ovulated.