16 and pregnant

I just found out at the end of last month that I am pregnant. I'm two months,Ive felt naucious quite often and i'm already showing,people keep telling me its cause im tiny and very thin,true? I also started having back pain? can someone give me advice or something,im alone on this one.,

i'm not sure what to say!! cause i'm trying for a baby!!!
but enjoy the pregnancy.
their's not alot out their for back pain's when you pregnant!!
people say that exercise is good for back pain's in pregnancy!!!
i hope that helps!!
good luck!!