Third baby weight gain?

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Has anyone been slow to gain weight with their third pregnancy? I lost 5 in the beginning due to being sick. Currently about 17 weeks pregnantand have only gained 2 back. I eat, but just not super hungry like I was with my other two. I thought maybe it’s bc I’m more active chasing two kids down. I’m sure it will catch up in the end but I didn’t know if some people just hadn’t gained as much with their third?