Congratulations on your pregnancy!!

Now to the topic lol.. I think your situation isnt easy and i can see the ups and downs this will bring.
I had my 1st at 16 and 2nd at 17 and while i had the best relationship, my xdh cheated and we seperated. Not due to children but due to him being stupid and selfish..
If this is what you want and are head strong on this, then i say good on you. age is not a factor its what your willing to do and not do to protect,love and nurture this child till the day you die. No one is ever ready for a child, in saying that i mean until you do it and experience it you never really know what parenthood is about, the ins and outs arent always pretty.
but in saying that its the most beautiful and warm experience you will ever ever have in your life, this is what will show you what real love and compassion is..
I believe if you are willing to always be put last and always give and not expect anything in reurn then go for it.. but dont turn a blind eye and think that its the easiest thing in the world. Be prepared for the the bad the ugly and the beautiful.!!
I think your partner is scared and is maybe thinking of the what if's instead of the what is.. itms? for that i cant fault him
I think you need to sit and talk about this seriously, and figure out what you both want and go from there. it wouldnt be easy having constant negatives arounf you both. Isnt going to make it easier to see the good.
If he isnt ready and you are really ready to be a mum then you need to know where you stand now instead of later, because it wont be any easier nor be better.
You are going to need support and stress is a bad factor in pregnancy and for the baby.
You sound like you have alot of support from your parents (mum) and thats great, its hard enough being a single parent without having that added support if needed.
Just remember what ever you guys decide, and what ever you decide its your choice, its your body and no one can ever make you do something you dont want to...
Keep your chin up and stand your ground on your decisions and make sure that you are doing whats best for you and no body else..

P.s im not talking you out of having a baby im actually on your side just thought id add that so you dont thinkim ganging up on you..