My fiancé ovulation date was may 28th. She took a test a week later and got a very faint pink line on a first response and then two days later she took a clear blue test and no lines at all . About an hour after that she took an first response early detection digital test and it came back yes positive. So she waited another two days it’s now Wednesday today and she took another first response digital test and came back negative and then did another line test a couple hours later and it has a very faint line. She’s 11 dpo. Does anyone know what’s going on? So inconsistent tests