Reataing too much water at 32w&5d

I went to the doctor yesterday and my belly measured 32.4cm, which is perfect for this stage of pregnancy. Baby is doing great, a wonderful solid heartbeat and is growing properly. However, i was told im at a dangerous point of retaing too much water. So, to balance myself..me and my SO have been walking 3 miles the past 2 nights. Its not preeclampsia and when i push on my legs its not dented, vuuut there is a white fingerprint that stays for about 4 seconds and fades away.

Ladies, mind what your eating, your baby's health is important...but so are you!