I need some help

Se
I recently found out my husband sometimes hiding something from me. Let me tell you the story. I studied accounting but couldn't find a job in this field. Last year my husband and I decided to buy our own house, so we went through model town houses and now our future house is being built. My husband salary is good enough for now but I knew that next year with mortgage it's not enough for both of us and the baby in the way. Since then I felt it's better to take care of some financial matters, so I found a job in restaurant and started to work in the kitchen and ask him to save for next year.I also asked my parents to live with them that we can save more money ( not to pay for rent) and they can help me when my baby born. But since 3 months ago I found out my husband is spending money on the the things that I'm not agree with it. For example two months ago, he bought a fish tank with all the stuff which cost him $500, last month he donate $200 because his cousin ask him to do and last night I found out he is helping someone and deposit $300 to their account which I have no clue who are they ( he forgot to log out his bank account on the computer, so that's how i found out)! I try to talk to him few ttimes since tthen and tell him that if I'm working in heat while I'm pregnant (which is so hard for me standing on my feet for 8 hours straight) it's because i don't want to be in trouble in future. But he doesn't listen and keep spending money on unnesessary stuff and I know if I tell him directly he gonna be more careful and I can't find out if he will spending money in future. I don't know what to do and how to speak or act with him. Could you please give me some advice ladies :'(