my case is not updated since 12 December, 2017

I have given interview on 12th December, 2017 for my f1 visa at new delhi embassy, india. embassy collected my passport and give me white slip in 221g . I submitted my all documents on 16th december, 2017. Till date there is no any update on my case. i regularly check my status online. but the last case was updated on 12 december, 2017 only when I gave my interview. I had already my B!/B2 visa. previously the same thing happened with me but at that time I got my visa exactly after one month. now there is no any update on my f1 visa. Can anybody help me.

If it is more than a month, you can write to the embassy and ask for update.