normal?

K, so I posted this earlier and one response so I'm hoping for more now that I've asked my doctor and am not satisfied by the response.
So I'm 10 pp now and my first period, last month, was barely even what someone would call a period. Two days of an occasional streak of blood and no cramps or anything. Well last week I got my first real one and for the first 4 of the 5 days I got no cramping which is weird for me. Then on the last day I started getting cramping sometimes. Well now I've been done for two days and I've noticed that everytime I nurse my little girl I get some substantial cramps during and for like 20 min after in my lower back and pelvic region - reminds me a lot of the cramps from nursing right after having the baby. Now I don't know if this is normal and I'm just getting my first period so late that is seems weird to me or what. The doctor said it's my body reacting to the ocytocin from nursing which makes sense. But what doesn't make sense to me is why it comes after my period is done and stays around even when she's not nursing. Then he told me that it's my body's way of weaning which seems to me to conflict with his earlier statement. Does this happen to anyone else?

Im not sure   But good luck and i hope you figure out what it is!