Why is this so hard!?

I've had an amazing pregnancy. No morning sickness, been feeling great, not too much weight gain UNTIL I hit 30 weeks and now my pelvis is splitting and it hurts. I literally broke down crying trying to walk up the steps last night. I don't want to go to work because I just don't have the energy. 
Part of me is tell myself I need to get over it, I'm not the only one who's been pregnant. Yet the other half is telling me to take it easy. 
Gah, pregnancy is hard. 😩