Constantly thinking abt the weeks I'm in

So It's my first baby and recently I was confused on how many weeks preg I am until I called up and found out. I was told I'm in my 5th week and all this time I was thinking 6th. Anways, now i'm a little nervous and also disappointed that i'm still so early into my preg..i guess i wanted the first trimester to fly by so i can start showing and tell others abt it. I'm constantly thinking abt my preg..how can I help myself to relax? Is anyone who went thru the same thing as I am. It's my first too so I think that has alot to do with it. I tried reading but my mind keeps drifting . I'm also nervous since my sis has a miscarriage so that's constantly on my mind too.. I know everyone is different so if you went thru it ..any suggestions would help.