We were planning to move to oregon but i don't think its a good idea....?

My fiance and i are 18. We live with his mother and brother and i think his GF just moved in b/c she's been here for almost a week now,But um, my fiance and i just found out that i am 5 almost 6 weeks pregnant, he's still in HS and graduates 6/6/2008. I have my ged. i work seasonal/full-time @ lowes that ends 2nd weeks of july, my fiance is working part-time @ ollies. I told my fiance's mother and him this morning i don't think its a good idea to move, b/c by the time we were planning to move i'll be 5 almost 6 months pregnant and my doc wont let me. I mean yes oregon is a nice state and the housing is lower and the minium wage is higher but my fiance's mom said something about low income housing. but i know nothing about that kind of stuff. But right now we pay her $400 a month,$63 for our phone,$96 every two weeks on the bed and $20 a month on the credit card we don't have. I already did apply for welfare but just waiting on that for the pregnancy. but do you have any advice?