Hi, I’m TTC using IUI as a solo mum. I’ve been testing for ovulation using clear blue advanced digital. Because of taking letrozole I’ve been testing from day 8 - got high on day 8,9,10,11,12. Then yesterday got a peak on day 12 PM. Tested again this morning using a new holder and it’s showing as low?! Has this happened to anyone else? I’m worried I’ve missed my chance to have IUI this month.