Normally use the normal clearblue digital opks that pinpoints a day or two of peak.
Thought i would try the advanced for a bigger fertile window... started on CD9, as I forgot CD8 and was O - which is fine. But today (CD10) I have quite a lot of cm, which is somewhere between watery and stretchy and still got a negative.
Bit confused as I thought I would have a rise in Oestrogen to trigger the cm? FF has put today as a fertile day regardless.
No idea which to believe 🤷🏼♀️