Ovulating?

I was diagnosed with pcos 2 weeks ago and was put on metformin. I went to the doctor Monday, cycle day 14, to see if I had an egg. And I did!! But the doctor said that I looks like I’m a CD 16 ovulater. Well, today is cycle day 16 for me and I woke up this morning and used the bathroom and there was some light pink blood. Is this a sign or ovulation? Or something else?? Thanks 🙂