I swear I will get bashed over the head with this because I say it so much lol but... are you temping? OPKs will tell you little about ovulation and when or if it happens. Temping will give you a much clearer idea. Imo, OPKs are only useful when used with temping because you can surge more than a single time in your cycle if your body doesn't ovulate with the initial surge. Thermometers (basal body thermometers, the kind with two decimal places) are cheap on Amazon, all you have to do is take your temp first thing when you wake, before you do anything else and enter the reading into an app like Fertility Friend or similar, that way you will see an obvious temperature shift when you ovulate. It can also indicate any issues, say if your temps are consistently low, chances are you have a hormonal imbalance which could possibly be fixed quite easily. If you haven't already, give it a try as you don't have anything to lose by trying it, but it could prove a huge help