Hi Aussie Chick

10 days is a "normal" luteal phase, so there's nothing to worry about (ha, ha, blooming ha - we'll always find something to worry about, right?). Prolactin affects ovulation, not LP per say, and the test for this is a prolactin blood test. The "normal" range on UK tests is very conservative - usually we don't worry unless the person has twice the maximum for "normal" (ie over 1000mU/L), and if you're breastfeeding, or just stopped, most would advise that you check again in 1-3 months to make sure the level is coming down, and how fast it's coming down. Once the prolactin goes back to "normal" then your body should as well.

HTH