Moving issues

Can I just rant here for a minute?  
In need of advice:  Am I right, or am I wrong?  
To start off I'm a young mom.  18 years old, just barely graduated high school, and expecting my first baby sometime this month.  
I am with my boyfriend, who is also my child's father.  He is currently working in Nevada beause of better job opportunities.  I live in California.  
We both planned that after the baby, I can stay with my family here in Cali until the end of July, then move up there with him before I start online college.  I live with my mother.  Now, she isn't the best mother.  She smokes cigarettes and marijuana play god knows what else.  She has major mood swings and does take it out on me sometimes.  Somehow, we make it work every month.  
Recently, my mother and I have been arguing more.  She has gotten mad to the point she told me to pack my stuff and leave.  I then said I would.  Long story short, she apologized and told me to come home. (Since I was staying with a friend) 
After I told my boyfriend about the fight he told me he wants me to leave the house a week after our son is born.  One week.  
This is where I start to rant.  First I wanted to stay because my grandmother is retired and my mom doesn't work.  I have friends and family friends who have helped me tremendously just with pregnancy alone.  I wanted to say atleast two weeks so I can receive help and learn some tips on how to care for a newborn.  
In Nevada, I would live with my boyfriend and his parents.  My boyfriend works over 40 hours a week as well as his parents.  At his house, I would be alone majority of the day until I see them for maybe a couple of hours until we all turn in for bed.  They all work 7 days a week.  
I am getting called selfish because I am putting my child and I in a household (with my mother) that is not always the best environment.  Yes she yells and goes bipolar, but being her daughter for 10+ years I know how to handle it.  
Am I being selfish for wanting to stay in California to receive more help for the first few weeks?  Instead of immediately moving with my boyfriend and his family?  My boyfriend just wouldn't be able to see his son for 2-3 weeks.  That is all I asked for.  To receive help from family and friends and to also say goodbye to everything and everyone I've known my whole life.  
Very sad and undecided at this point.  Please let me know your opinion on my situation.  Advice is very well welcomed.  Anything is helpful.  
Thank you.  ❤