I used these tests when conceived one of my children, and they worked great (that was back in 2011). This year I thought I might be pregnant and purchased these tests. I was surprised to get a faint positive on one. I tested five days in a row getting light positives with these tests. I tested my tap water to make sure - negative on the tap water. The sixth day I got a negative. I thought I was having a chemical pregnancy and was devastated. I tested the next day and the following day and got the faint second line again. I checked the batch number online and sure enough this batch (many a few others) had been complained about by several women as giving false positives. I will add the lines were showing up within the time frame and they showed up pink. They were not evaporation lines. All the ones that were negative stayed negative and did not develop evaporation lines.A very upsetting experience.