So this is my second cycle ttc after 4 years on mirena. I'm using digital opks. My first full cycle was a normal 28 days. This cycle, glow had me set to ovulate on the 22nd (cd1 was the 9th). I've been taking digital opks (first response, the ones with the solid smiley, not the ones with the flashing and solid one) and I haven't had a positive yet. Could I have missed it? Is there a good reason why I may have just not ovulated this month? Any advice would be appreciated, I'm getting pretty frustrated. Thanks.