You are going to need professional help unless your boyfriend makes over $50,000 per year. And having saved only $9000 that doesn't sound convincing at all. Once the baby is born, you're not going to be making any money because you will have to hire day care while you work -- $12,000 per year -- not practical because at 18 your job prospects for a comfortable wage are not stellar.
All this aside I wish you all the best but you have to be VERY practical about this. You now have a baby to think about. Do not go into this decision without the strength and conviction of the numbers and your boyfriend's complete buy in (get married). You and your boyfriend need to really get it all on paper so that there are NO unexpected expenses. Most divorces / separations occur because of monetary issues. If you can get all the finances squared away then you have a chance of making moving out possible. This is no longer a game. BOTH of you go to a financial ad visor and you really should consider staying with your parents and finishing school or somehow getting a degree. You are going to be heavily reliant on medical care and costs so you need to be on your BF's insurance -- NOW..
https://www.daveramsey.com/company/contact-us CALL THESE PEOPLE. NOW.
A typical home averages $150,000 to own outright. If you get a mortgage, the bank holds the title to the home and you pay interest on a loan for the home. Depending on your interest rate on the loan (e.g. 5%) you will end up paying an additional $100,000 in mortgage interest payments over the life of a 30 year loan. For the first 7 years, the majority of your mortgage payment goes into servicing the interest of the loan -- this is generally more expensive and is essentially the same as paying rent for the first 10 years. Until then you hold all the responsibilities AND liabilities of owning the home while the bank actually owns the property.
When you RENT a property, you have no liabilities of a mortgage and you are free to move around to areas with better school districts for example. The apartment has amenities and maintenance is included. There is NOTHING wrong with renting. The term "Paying rent is throwing money away" was created by mortgage lenders to get more people to take up mortgages. "Paying interest to the bank up front (mortgage payments) is throwing money away" in much the same way.
Paying a mortgage and home ownership (paying rent to the bank and assuming responsibility for liabilities).
1) Majority of payment goes into interest.
2) Bank owns property.
3) Mortgage holder assumes responsibility and risk.
4) Owner is responsible for property taxes, maintenance, insurance and utilities.
5) Value of home is subject to market forces.
6) Difficult to move.
7) Home owners association fee to pay for amenities.
8) Homes are usually larger than comparable apartment / rental housing.
TIP: PAY DOWN AS MANY POINTS AS YOU CAN and look to see what government program benefits are available.
Vs. Paying rent / apartment (Building management assumes most responsibilities)
1) Payment of rent to reside in an apartment complex / condo /home
2) maintenance costs, rent, and often some utilities such as water and sanitation are included
3) Often 1-2 months are free based on special offers / deals.
4) Good apartment complexes have excellent amenities (pool, clubhouse, etc.)
5) Freedom to move to pursue better opportunities (jobs) and school systems.
6) Generally significantly less expensive.
7) Apartments are smaller.
Here are some numbers.
Home ownership with $150,000 mortgage
$1500/mo payment
$300/mo utilities, maintenance, taxes
$150/mo insurance (home / auto)
If you total and add in food, expenses and everything, it easily comes to $2500 per month. With a baby, $3000
To make this all work your total family income needs to exceed $37000 TAKE HOME PAY or roughly $42000 salary.
Renting an apartment:
1) Cost variable ($600-900/mo)
2) $150 Utilities (no taxes or maintenance fees)
3) Renter's insurance $30 per YEAR.
4) Auto insurance ($80/mo)
5) Food / Misc expenses $500-$700. With baby $1000
Total cost is roughly $1900-2300 per month.
To make this work your total family income needs to be at least $30,000 TAKE HOME pay or roughly $35,000 salary.
These are just rough calculations. We don't know where you live and what the costs are in your area.
Think of all the things you would have to pay for, make a list of the potential expenses of mortgage payments or rent.
(There are calculators all over the internet). http://www.trulia.com/rent_vs_buy/
Good luck and please seek PROFESSIONAL advice. It's usually free.