Large placenta?

Kayla • I`m 27 years old and have two wonderful little girls, have been married for 8 years and we are now having a baby boy 💙
Had my gender scan today at 15weeks 2 days. During the scan we noticed my placenta was extra large looking and the tec mentioned it a few times. Is this something to worry about? I had placenta previa with my last baby. I'm going to ask my doc about it next Tuesday just looking for any insight from you mamas :) thanks! 
The grey blob looking thing under the baby is my placenta in this photo..