Belly measuring small

So I’m currently 32 weeks and between my last two appointments my belly hasn’t really grown any. My doctor asked how much my daughter weighed I said 7.03... he said our son would not be that big at all. Then told me he wanted to schedule an ultrasound to check on him. But he didn’t seem overly concerned I was okay but I started reading about reasons why he could be small... I feel like he’s just super low into my pelvis since it is my second and I feel tons of pressure from him already. Any positive stories y’all have would be appreciated please. Here’s s picture of my tiny bump. My daughter is on the left; this pregnancy is on the right.