I always use FRE ( First Response Early). Clear Blue Easy is also a good one. These are two that have no evaporation lines and are high on the consumer reports. FRE is one of the most sensitive tests there are which is nice. Here is a link that shows the sensitivity of pg tests: http://www.fertilityplus.org/faq/hpt.html
Angelia
HTH!
Tara
Tara~ co-cl of Pregnant after TTC