Feeling Discouraged...

Jill • Married • 35 • PCOS Daughter born 23/09/2015 Daughter born 27/03/2019

Just did my first round of Femara (5mg) and am on cycle day 20 with no positive opk. I am testing twice a day (10am and 6pm). The lines are so so close but not quite there. If the femara had worked would I have had a positive opk by now? Is it possible to ovulate with only being close to a positive opk but not a full "blazing" positive that I was dreaming of?