My first pregnancy?

So I JUST found out I am pregnant 2 days ago and I still haven't taken it in yet. I suspected I was pregnant so me and and my boyfriend confirmed it with a doctor's appointment. When I told him that the doctor said I was pregnant he had a "OMG" look on his face but a few minutes later he was excited about it. I was NOT excited. I'm only 20 yrs. old trying to get on my own. My boyfriend is 24 and we are looking for our first apartment together. So not only do we have to save for a security deposit, furniture, and other household things...we gotta add a baby to the mix. Neither of us didn't tell his mother but somehow she knows? But this is both our first child and I'm NERVOUS. I know a few things about pregnancy but not too much. I only missed 1 period so I could only be a fews weeks. But I scheduled a prenatal checkup. Are they going to tell me how far along I am? Am I going to hear the baby's heartbeat? Am I going to get a prescriction for prenatal vitamins? When is it going to hit me that I'm pregnant?