Worried sick

Jessica • Expecting baby number 2! Due March 18th, 2016!
I had my first ultrasound/doctors appointment around 6 weeks. Everything was great, baby's heartbeat was fine but ever since I've been worrying like CRAZY that my at my next appointment(in two weeks) will not go as smooth. I'm not sure if it's because I've seen a few people announce publicly about their miscarriage they just had or if I'm just anxious for no reason but I'm terrified that baby won't have a heartbeat next time :( I've had no spotting, no severe pain and my morning sickness seems to have subsided. I'm 9 weeks today and I just can't remember having this kind of feeling with my first pregnancy. I feel as though I'm convincing myself that this pregnancy isn't viable or something. I literally can't stop thinking about it! :(