Super nervous!

I got my bfp 2 days before my missed period and I'm super nervous that I found out so early. I'm just so worried something could happen this early :/. My best friend found out this early too and she had a mc :(. I know being anxious is total normal at this stage so I don't know if it's from that or just hormones everywhere or what. This is also my first pregnancy. All my symptoms so far are mild cramping off and on, headaches, lower back pain and really tired. I'm just worried one day there all gonna stop :( anyone have any advice?!