Prolactin?

Kim
Hi ladies, my OBGYN took blood for various reason, as well as prolactin, when I told her hubby and I would be TTC baby #1.
I'm a little confused as to what exactly the Prolactin is suppose show. It's too early to determine if we have conceived as AF is not due until 8/20. My Prolactin came back as 6.9 ng/ml. Can anyone give me some insight on this?
Thanks in advance!