I just want to share my story and express my concerns!

I'm 21 and always had a fear that I'd never be able to get pregnant. I know it might have been silly to worry about but I could just never picture myself pregnant or with a baby. I've been with someone for a year now and we usually use the pull out method but last month he didn't pull out a few times, now here I am 6 weeks pregnant! I'm still in shock and don't believe it. I've taken 6 tests so far just to make sure and they all come up positive within seconds. I have a dr. appt in 6 days just to really confirm. When I look at the pregnancy tests, I feel like they aren't mine and in looking at someone else's, it really hasn't hit me yet. My two main concerns are having a miscarriage (or an unhealthy baby) and telling the baby's father. I'm really scared for his reaction honestly because I know this is the absolute last thing he wanted. Ever since I found out, I started taking prenatal vitamins because I want to do everything right to make sure this baby is healthy. When is an appropriate time to start telling people?