First pregnancy Q.

I always see pictures on Instagram of women that were, or are currently, pregnant that seem to go out a lot and have so much energy. This is my first pregnancy and I always feel drained of energy. I do go out with friends, go eat and walk around, but within a few hours I have to go home because I feel like I'm in desperate need of a nap. Makes me a little sad because I wish I could stay out longer without feeling so miserably tired. Other than that, I really enjoy my pregnancy so much and I'm extremely happy and blessed to be able to experience this.