I'd say pulled muscle or maybe gas pain
I dont think it has to do with the baby...you're only 7 weeks theres no way it coukd be the baby sweety. Id go see the doctor. Perhaps it could be a pulled muscle or something.
I did experience this but at about 29 30 weeks...my doc said baby was kicking and pushing up against my ribs...
I tried sitting in different positions to make me feel better...
If u r really worried go get check OUTm.
I did better safe then sorry :)