When to test?

It’s been a while since the last time I was TTC. I want to test ASAP!! I know supposed to wait til missed period but I can’t wait any longer. My last cycle was 4 weeks apart exactly. But they aren’t always that close, sometimes they are 5 1/2 weeks apart. I’m pretty confident my ovulation day was accurate according to app. I was spotting the days leading up to it. When is the earliest I could test with first response. Would today be too soon?