5 weeks - weight gain is scaring me !

I have only recently found out I'm pregnant after trying to conceive for 18months . This weeks coming up the 5th week and the bloat I have is unreal! I've gained about 3 inches around my waist already and 2 around my chest ! I am ultra gym and run freak so I'm usually lean at the minute I resemble a burst couch ! Is this normal 🙈😂