1st pregnancy miscarrige, pregnant again and really scared

I was pregnant for the first time at age 17, i was really excited but scared i didn't even get to hear a heartbeat because i had not even done a check up with my doctor because i thought i needed my mother and she didn't know and i was scared so i thought i would wait, i think that was the worst decision i could have done because maybe if i would have done a check up earlier i would have my baby with me, right now i am 15 days late and i'm so scared i might miscarrige again