When is it considered abnormal and something they will monitor..

I've been gaining weight gradually and dr hasn't said a word about my weight.

I'm 30.5 weeks now and my last appointment was a week ago. I weighed 147.6... i weighed myself at home.. (note: I weigh myself at home before every appointment and its always about 1.5lbs lower than the drs scale)

I weighed 154.4lbs!! (So wpuld be 156 at drs)

HOW did I gain roughly 10lbs in one week. Is that even possible.... i weighed myself like 4x because it was a shock.

Should i be worried? My next appointment is next week..