Thrown out back

Ariel
So I threw out my back for the second time this month. It so painful that I can't not stand up straight. Not being able to stand straight makes walking almost unbearable. 
The part that worries me, is that when I am standing or walking, my entire abdomen tightens and flexes since my back can not support the weight of my large stomach (I'm 32 weeks pregnant). 
I don't know what to do. Tylenol doesn't even come close to helping 😩