Stressful... Help?

Hello let me just explain this i'm 19 years old have a part time job, my fiance is 21 and has a job as a manager, with our amount of money we still cant afford to live on our own.... We live with his family of 8 people in a very small house 2 bedroom, no basement, one level home. Its too small to have my baby girl living here, but his mother tells me we'll move so their will be enough room for her & you & your fiance so we can be happy. The only house available is the house next door to us.. the lady who lived there died last year and they still havent moved her stuff out, the neighbourgs are very close yet his mom won't ask him if we can move in there but my baby girl is due in 3 months & i still have nothing set up for her, and havent bought anything because i cant even put anything in the home because of the space.. My side of family is no where to be found in this situation (out of my life) meanwhile i'm trying to get most of my college done before she comes and i cant when i have to deal with this amount of stress.... And we dont qualify for welfare or housing benefits!!! What do you do in this sistuation!