一般探亲回中国6个月以后才能申请其他签证。 如果你有老公单位在职证明， 收入不低于20K， 现在就可以申请配偶签证。
Tell them you have a valid visa. It is none of their business whether you stay 1 month or 3 months, as long as you have a valid visa. Even you filled 23 days in the application form, plan might change