Thanks for the replies...the CHN recommended I express after each feed to boost my supply because DS hasn't regained his birth weight yet. So she thinks he hasn't been getting enough from me. I had only been feeding on one side each feed so she has suggested to feed both sides and then express a few minutes afterwards.

Joshua was 3 weeks early and his weight gain has been:
Birthweight 3195grams and lost 10.9% at day 3
Day 6 back up to 2950grams
Day 10 3000grams
Today day 24 back up to 3150grams

He is almost there but he has only put on 150grams in the last 2 weeks when he should have put that on in one week.

I think my attachment is pretty good, my nipples come out the same shape afterwards and they are not sore or grazed.

I am just now paranoid that DS is not getting enough to eat!