ANSWER:

It is prohibited to save from the monthly house expenses that your husband gives to you without his permission. If he gives this as a gift for you to utilize as you please as if it is pocket money, then you can save that and do with it what you like. But if he gives you this ONLY to use it for house expenses, you need his permission for that. 

Fixed time deposits are usually riba based and this is one of the 7 major sins in Islam. 

As a house wife i tend to save aome money from monthly house expense n over the period Alhamdolillah i have saved enough but I would like to invest this money so that my money can grow and the easiest i find is fixed deposit but the shariah doesn’t allow, so please can you guide where can I invest according to sunnah.