Vanishing twin syndrome 😢

Last week I found out I was having twins, i got super excited since I'm a FTM, But lately I've been really nervous about vanishing twin syndrome a few people told me that because I'm only 7 weeks that I'm more likely to lose one. My morning sickness has been kicking my butt and I haven't been able to take my prenatal vitamins, I feel terrible that I can't do anything to stop this from happening!!! Anybody else nervous? The nurse said I won't get another US until almost 20 weeks, I would die if I wait that long thinking that I'm still having twins and one has vanished. 😩😐😔😕 I love my babies more than anything already