Confused 😐

Can you ovulate on day 31 of your cycle?? I am going on to 11 days late and today I experienced some light pinky spotting which lasted a few hours only when I wiped and some on my pantie liner (tmi). I had sex today and didn’t spot or bleed at all... wondering if this is implantation bleeding and if so would definitely mean I ovulated late. I’m so confused this has never happened to me before and I have 3 kids!!! But, this time around I’m actually planning my pregnancy. Been ttc for about 6 months on and off. Please help! Any advice will be appreciated 😬