worried momma

I'm 24 I've never been pregnant but I always wanted kids. I waited til after I got married then started trying, I remember the first 6 months anticipating and so excited for that positive test it never came. Then a year passed and 8 months later without even expecting it I'm pregnant! I'm so happy first thing I did was thank God for this gift I'm 5w4days had my first prenatal appointment yesterday and saw my little bean (no heartbeat ofcourse) and it felt like a dream... Til doctor did a pap and told me I had an infection that needs to be treated ASAP as it's not good for baby could cause miscarriage. Like that I went from happy to dread, no I can't loose my baby was all I can think. So I'm supposed to go back to him tomorrow for a injection that's supposed to clear up the infection but I'm still a huge bundle of WORRY. All I can think about is my baby I want to have a healthy pregnancy I hope this doctor knows what he is doing and everything turns out fine... I just had to vent