So over the last few days I’ve took a variety of tests (multiple brands to check) and originally they all had shadows of lines. However this morning I tested with fmu with a clear and simple test and it showed a faint but definitely there and definitely pink line. When I googled the sensitivity of these tests it said 20mlu so I tried the early digital I had as these say they are 10mlu. The digital came back negative but I’m just wondering how that works? Is it really 10mlu?