After 3 losses and higher natural killer cells diagnosis I am now on Dr Shehata's programme. I have to take prednisolone from ovulation for 10 days, then test with a frer and if negative come off the steroids, if positive take an increased dose. The reason I have to test after 10 days is because the steroids can apparently delay the start of your period. I hate testing early though and I'm worried that I've never had such an early positive before ... anyone else in this situation?