Stressed

So I keep getting really worried about all the things that can happen being worried about miscarriages and blighted ovums. And it won't leave my mind. I am 6 and a half weeks along and I have my first appointment today but I know where I live they don't do an us until way later in pragnancy and I just want to know if everything is ok. Any tips on how to stay calm and positive it's my first pragnancy and we have told out parents this past weekend as well