I feel it on wk 8 aswell i'm on every 10 wks just now. I spoke to ma endo about it last time and she said we will talk about it next time so thats next month so hoping she will change it to every 8wks
I was on 12 weeks but could feel a slight drop off at week 10, I'm on 11 weeks now and don't really feel anything drastic but I am sure 10 weeker would be my sweet spot