Weight gain and pregnancy

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Am I gaining weight too quickly?? At 6w5d I marked my weight at 170# and today when I weighed myself I was surprisingly 185#!!! What!? Isn’t that a little much? I’ll be 21 weeks tomorrow. Am I gaining too quickly? To be fair, looking at my body I haven’t gained anywhere, in fact my mother says it looks like I lost in my face and thighs. My belly is huge. Should I be concerned? I’ll talk to my midwife too, I have an appointment with her next week.