Why would I be bleeding?

Mom Of 3🤍 • Mother of 3 (one in heaven) 💕 happily taken ❤️

I stopped birth control pill about a month ago just had my AF on the 7th of this month, I’m in my ovulation window still. Ovulated today, just used the bathroom and when I wiped there was blood was just a light pink but not enough to have to put a pad on. Why would I be bleeding ?