I have been using Belly Lab Pregnancy Tests for the past 4 years. I personally don’t like to do the mouth lance (I’m sure it can be done), I just get a few drops of blood drawn in my vet clinic, fortunately they do that for free for me, and the tests have worked fabulously. One one occasion the fluid was missing in the vile, Belly Labs replaced it right away. I recommend this product to other breeders who have been pleased to be able to confirm pregnancy at 5 weeks.