First trimester nausea

I am 6 weeks pregnant but I don’t have any nausea or vomiting... is this normal? I have back pain and some cramps in stomach that come and go. My breasts are also very sore and hurt. It is my first pregnancy so I am too worried about everything and hoping my little bean is okay. My first scan and doctors appointment is not till I am 9 weeks.

What should I do? Please advice!