Why is this happening?

I’m ALWAYS hungry and it’s annoying. I’m almost 27 weeks, and it’s an insatiable hunger. This morning I ate breakfast, and 10 minutes later my stomach was RUMBLING. As if I hadn’t ate anything? I just drank some water and had some yogurt as a snack about an hour later. So then, I eat lunch, and 15 minutes later my stomach is rumbling again. I google it and google says baby is “demanding more food,” so I eat a PBJ. I drink plenty of water and I’m not super active, so it’s not like I’m burning all these calories and it’s making me hungry again. I need to manage my weight gain and it’s pretty much impossible when I’m hungry every 20 minutes. Before pregnancy I could eat a very small breakfast and lunch, and be absolutely fine until dinner. Does this mean something is wrong? Is it normal?