Why are OVRY™ Pregnancy Test Strips considered ultra-sensitive?

Why are OVRY™ Pregnancy Test Strips considered "ultra-sensitive"? Is this a good thing?

Nearly all pregnancy tests currently for sale use the same underlying science: the tests are designed to detect levels of the pregnancy hormone (HCG) in a woman's urine. Most tests sold have an HCG detection limit of 25 mIU/mL compared to OVRY™ Pregnancy Test Strips that have a detection limit of 10 mIU/mL. This means the OVRY™ Pregnancy Test Strips are able to detect pregnancy sooner than many other tests. For many women this is a good thing because it provides them with an answer sooner. HCG levels typically start to increase from a level of less than 5 mIU/mL (directly after implantation of the fertilized egg) and on average will double every 48 hours during the first weeks of pregnancy. The one drawback of using ultra-sensitive tests is that they detect all pregnancies, including those that occur very early on and often miscarry before any physical pregnancy symptoms manifest (including a missed period). These pregnancies are often referred to as “chemical pregnancies”. For this reason, we recommend that if you get a positive result with an ultra-sensitive OVRY™ test strip that you repeat the test with a fresh strip and a fresh urine sample after the date of your expected period, to confirm a positive result.