Am I not ovulating?

Antonia • Happily married to the love of my life, LT and mom of boys, Six and Antonio. Excited for what the future will bring
I need some help and advice please! I am not sure I am ovulating. I've been testing with opk and still haven't gotten the positive result of the test telling me I'm ovulating. Here is some info 
• cycle is 28
AF due Aug 10th
• testing for 8 days straight (this cycle)
• today is cycle day 18
opk is the cheap kind (was trying to save money)
I just recently bought the clearblue advanced digital for next cycle and I am hoping that maybe next cycle I can get some clearer answers. I was hoping that maybe those tests are just not strong enough to detect the LH surge in my urine, but I'm not sure. This is the second month I tested and still never got the positive test results. I tested last cycle for 5 days straight before I just stopped. Both cycles according to the rule of the kits it said day 10 is the day to start testing since I have a 28 day cycle. Prior to all this I was on birth control for about 10-11 years. I've been off the pill for 4 months. As far as I know I'm healthy and don't have any medical conditions that would hinder me from getting pregnant or even ovulating. I am hoping maybe I'm just a late ovulater, but I only have 10 days left before AF is due. I've just recently started checking my cervical position and cervical mucus to help be an aid. I plan on getting a basal thermometer to track that as well. I found one on Amazon that I plan on purchasing today. Any and all advice, suggestions, and help is greatly appreciated! I'm trying not to get sad or stressed, but it's hard to have a baby of your not ovulating 😔

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