Wa'alaikumassalam sayang! 7 weeks pregnant memang banyak perubahan, tapi shortness of breath + tiredness macam tu, please go see your doctor or call your clinic, okay? Better safe than sorry, especially since it's your first baby. A few of my mum friends had similar feelings, but sebaiknya check dengan doctor dulu to make sure everything is okay. Could be normal pregnancy changes or something else yang perlu perhatian. Don't worry lah, doctors see this all the time!