Did I gain too much weight too soon I'm only 3 months?

I started at 145 pounds before pregnancy and now at 3 months I weighed in at 150.8 at the doctors but I haven't moved my bowels in 2 days, ate food and drank water before getting weighed.

Also how much weight should I gain to be healthy but not too big? I'm 5'4" 34 years old.
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