Just need some advice!!!

Iv just found out im pregnant! Cant be anymore than 8-10 weeks (got midwife in a weeks time) im just really concerned as whenever I walk a distance (not just around the flat) like to the shop I get a really painful Stitch on my right hand side - to point i have to hold it n slow right down.. is this somethimg i should be freaking about or is it just random stretching.... btw iv not had any bleeding or other pains just that.. please can someone put my mind at rest 🤔