New to OPK

My last period was April 25th, I didn’t have one at all in May. The app said I was supposed to ovulate on May 9th, and on May 14th I had very light spotting when I wiped only. According to the app I am 15 days late (I get my period every month typically). I have been testing for pregnancy and only getting negatives. (I didn’t test positive with my daughter until 7 weeks,

10 years ago) I’ve used FRER, Walmart cheapies, and Wondfos. I ordered OPKs and just received them today to try and see if I’m even ovulating. I got this result and since I just got them I’m not sure if I’m getting ready to ovulate, or if I just ovulated. Should I take the opk later today again to see if it’s darker or lighter? I’ve never used them before so any suggestions from those that use them would be appreciated.