My first kid was kind of an oops, this is our first time actually trying for a baby. I’m currently on my period but we’re planning to start trying this month. I bought a bunch of opk’s so I was just wondering if I could get some advice or tips?

My last cycle was weirdly longer than my previous ones, I got off BC in April and since then I’ve had a perfect 27 day cycle until July then it went to 33 days. I’m not sure how to account for that and when I should start taking the ovulation tests.