21 lbs Weight Gain at 30 Weeks Too Much?

At my last OBGYN appointment the doctor I had that day (my practice rotates doctors) out of the side of her mouth asked what was going on with my weight and even went so far as to ask me “if I think it’s real” that I’ve gained 21 lbs so far this pregnancy. I admittedly eat out for dinner quite often due to my current living situation but I didn’t really think that 21 lbs was THAT horrible for her to ask me if it was even real. Of course hormonal me had a good cry over feeling like a cow after for a good hour or so. Even my boyfriend who was in the room after couldn’t believe how she approached the subject. Is 21 lbs actually too much??