Ovulation confusion

Samantha • FDC Educator - Married 28.10.2017 - Miscarried 23.01.2018 and 4.04.2018 - Pregnant Due 12.1.19

Hi all. I had a chemical pregnancy at 4 weeks last month. I have been using ovulation tests since CD 11 with no positive. The tests have been getting darker over the last few days but no positives. Does it look like glow is right on this ovulation date or should keep trying?