First Baby

Was told about 4weeks ago I was expecting my first baby! Super excited. I have not had an ultrasound yet due to them wanting my levels to go up more so I won't be seen until what is supposed to be 8week check up, but have had people tell me they see a bump already and I also see it in more shirts than others. Is it possible to have a bump already or could I just be measuring further along then what we think? Could it just be bloating?