Weekly Budget

I was wondering why the money came out so fast than I expected. I thought last week, I did withdraw money from my ATM card. I was hoping that the money can last for few weeks. But today, I realize that I don't have money anymore in my wallet. I did not do something crazy this week. I did not shop something that I don't really need. I thought I just shopped important things for the family. Grocery and some gasoline were mostly the things that I paid with that money. But how come I don't have money left in my wallet now? Why the money come out like water nowadays? Do you also have similar experience like this? My husband said it's because I did not make weekly budget for the money that I spend. But if I do make weekly budget, who's gonna pay other things that we need to pay which is not in the budget?

Argh... I have to find more ways to earn more money on the Internet I guess. Any suggestion?