First of all Congratulations.
Honestly don't panic, I was 19 when I fell pregnant with my daughter, 20 when I had her.
I now have an amazing 3 year old best friend. She's fantastic and very intelligent. I'm now close to my Due date with my second, I think it's great being able to grow with your children, and hopefully they will still want to socialise with me when they are older and we can enjoy things together! ( although I don't think age should come in the way of this ).
I now have a bought house, am a manager in my job and have settled very well, I did think I would struggle to achieve things being a young mum but in fact it gave me more motivation and drive.
Age doesn't matter when becoming a parent, Patience, care, love and sensibility does, you'll be fab hun !
Enjoy your pregnancy xxxx