When do I start counting weight gain?

I am 20 1/2 weeks pregnant. I understand you start counting in the being when you find out. My question is do I count the weight gain based on my pre-pregnancy weight of 181 or since I lost 11 lbs during the first trimester do I count based on the 170? So right now I weigh 174 so do I still say I lost 7 lbs so far or I have gained 4? Does that make sense?

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