Lh surge question

Carly • I am 32 and from Southampton in UK. Me and my oh are TTC baby number one. Had miscarriage in January 2015.
Hi ladies so I have a question please. I had a miscarriage in January and this week was my first month of ovulation after my first cycle after miscarriage. Today is predicted to be my most fertile day only the ovulation test States no lh surge. I have taken ovulation sticks since last Friday and yesterday's was the darkest it got but still slightly lighter than the control line. Do you think this means I have not ovulated this month? I have been feeling the normal ovulation twinges but not a clear positive test. I know it has to be same colour or darker but if it was only slightly lighter than control line and a lot lighter today, I'm wondering if I have ovulated? Any thoughts? Please. Thanks