Weight gain 23 weeks

So today at the doctor I found out I've gained 2 pounds in 6 days, and that I'm at a total of 20 pounds of gain, at 23 weeks. I have been trying to be healthy I am moderately active and eat as well as I can and I still feel like I'm gaining a lot. Before I was pregnant I never gained weight I stayed between 135 and 139 so it's so discouraging seeing this much weight so fast. I don't want to be that person that is obsessed with the weight but is this an ok amount for a height of 5'8? I notice that my thighs and butt have gotten bigger and my boobs have gone up a cup size. Is this all normal and okay? I don't feel like I look huge but I also see myself everyday. My stomach was fairly thin before I was pregnant so I'm wondering if it's adding more weight because of that. Here's before and after of me early in my pregnancy, maybe 7ish weeks and me a few weeks ago around 20-21 weeks