Best advice I can give you is try not to stress if you are stressed the baby is stressed. Also, do not let people tell you how to do things! Its your decision of how to do things. You are not the only young mom! I am going to be 20 years old in 3 weeks and I am 30 weeks and 5 days pregnant (: it is definitely an amazing blessing and I wouldn't trade it for the world. I love my son so much and I can't wait to meet him ♥ good luck hun!
Just be happy I'm a ftm and not married and only 19 myself so I understand your situation. It's scary but so amazing. I'm 25 weeks pregnant and the time is just flying by. I'm having a boy and given my circumstances I still wouldn't change it for the world. I feel so blessed lots of women struggle to get pregnant so take pride in becoming a mommy. When he or she is born it will be all worth it. Congrats and I wish you and baby well! :)
Oh and eat healthy and try to avoid stress if at all posible
Go to a dr and start ur prenatals and good luck