third trimester weight gain correlation to post partum body

I'm plus sized and in the first 2 trimesters lost a total of 21 pounds. The weight loss was due to just really paying attention to what I was putting in my body. I was scared if develop gestational diabetes. And I didn't! Thank goodness. I didn't work out but I do work retail so I'm always moving. I'm almost 30 weeks now and I've gained back 8 pounds. Which I'm assuming is all baby since my eating habits haven't changed at all. My goal is to gain a total of 15-20 pounds which is totally doable since I've only gained 8 so far. But I'm wondering what other moms third trimester weight gain looked like and how your body recovered after baby. Here's my most recent pic at 28ish weeks.