overwhelmed =/

i'm only 19 years old and just tested positive that i am pregnant. i'm with a guy that is 23 and we are very much in love. we both have very stable jobs and im in school, but i cant help but feel overwhelmed. i havent yet told my mom and im not sure how to. i am so happy and excited to be bringing a baby into this world. is there anyone that could give me some advice? or went through a similar situation? i would really appreciate it!