Apartment searching!

We live with my sister in law my brother and their two kids. I am 37 weeks pregnant and cannot live with them any longer! We have been looking into places but everything is so bad where we live! Was trying to get into one of the apartments that go by your income but idk how to apply because my fiancé just got laid off so my income is our only income... I live in the Brockton ma area. Can someone please help me!!!!