Ohhh placental lakes tu normal je actually, quite a few of us had that showing up in the scan, don't worry! It's basically just fluid-filled spaces in the placenta and usually nothing to stress about, tapi memang best to ask your doctor about it during your next check-up since setiap pregnancy is different. One of my mum friends had the same thing and her gynae just monitored it, baby turned out fine. What did your doctor say when they saw it on the scan?