Periods after birth control ttc #4

So I stopped my birth control pill at the end of May. I have had somewhat regular “periods” since then timing-wise, but they are a lot lighter than they used to be. They start out just spotting for days and then usually I get some decent bleeding for a day or two. My suspicion is that I’m not ovulating. I have 3 healthy kids ages 5 years, 3 years, and 21 months. It has never taken me more than 3 months to get pregnant before. Any advice or similar experiences?