Hi all, I had a rise in my BBT for 2 consecutive days post ovulation. (ovulation day 17 of cycle, then days 18 and 19 high rise in temp) then after 2 days I had a significant dip for 2 consecutive days (days 20 and 21 dropped significantly) and then it has risen again. could this be implantation dip? can implantation happen as early as 3DPO? I am confused, any insight would be beneficial.