Pink/darkish pink blood after period has ended in

Just had my period which was a short one to me and more light then normal, not as painful either. I have pcos I get heavy periods that go for 5 days that’s excluding the brown(old) blood at the end of the cycle and painful. This cycle was different anyhoo after period finished I had old blood for the past two/three days.

I just had this weird feeling down there, went to the toilet and when I wiped there was pinks

/dark pink blood. Nothing transferred to my undies but I have put a pad on.

What can cause this?

Partner and I are ttc but it’s more on the edge of if it happens it happens but if it doesn’t it doesn’t right now I am only 19 been trying for nearly two years. But that’s not tracking ovulation and when we should have sex. Just playing by here type thing.