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You are correct that you can get up to 1/2 of your husband's social security check. However, you are under full retirement age, therefore your benefit would be about 35% of his benefit. If you wait to age 66 you will get a full 1/2 of his benefit.
You cannot draw the spousal benefit early and then switch to your own benefit at age 66 - you could, but your benefit would be reduced just as if you had drawn at age 63