wondering if the clomid worked this cycle... help!

So I'm not sure if I'm going to ovulate or not. Only one working ovary. Last cycle I took 50mg days 5-9 and ovulated on day 19.... This cycle was 50mg days 3-7.. The opk got darker and then lighter (which happened last month) and then started to get darker again and now is almost non-existent. What do you think? Still early or maybe I'm not ovulating this month?... or do you think I missed it? I tested in am and pm and never got a 'positive'... these are all from pm.