Help OPK

Makensey

So I am only cycle day 8 after taking Letrozole on days 3 through 7 and for fun I took an early OPK only like a one hour urine hold and it was about 7pm. This was darker than I had in the past with clomid on cycle days 18 and later. Is this close for cycle day 8? I know it’s negative right now. Just curious, I’ve not had much ovarian pain or twinges. I actually didn’t have many side effects at all on letrozole. Should I start BD already?