A.S.
What is your rush? My goodness you're scarcely more than a baby yourself! :P
Seriously, if I wanted to get pregnant (at your young age) I would spend at least 6 months getting myself in fantastic shape physically. I would lose all the weight I wanted to lose, detox myself from caffeine and unnatural substances, and get my nutrition as wholesome and perfect as I could. That way my future baby would have a great start. And if I don't get pregnant, at least I'm in great shape.
Mentally I would do some work with a counselor to make sure I'm emotionally ready for a child. Have I healed my inner childhood traumas? Have I dealt with any traumatic experiences? Am I balanced in my spirit? Is there anything else in my life's path that I need or want to do before I become a mom?
These are just some thoughts for you - I hope everything works out for you the way it is supposed to! Nurture yourself, so that you can then nurture your babies.
JMO.
ETA: Did I see another mom mention you already have a child? Well, I still agree with getting myself physically and mentally healthy for the next one. Babies are a blessing!