Ovulation Help

Al

So I thought I had an actual peak on the 18th and last time I had a high test, it went back down to almost 0 after two or three days. I’m feeling like I am still waiting for my actual peak because it’s been 10-11 days and still reading high. Please help! Also my last cycle was around 76 days and currently on day 54. Stopped NuvaRing in May