Months of pregnancy ..

So I’m confused I always get confused with this even with my 2 year when I was pregnant with her .. everyone has been asking me how far along I am and I don’t know how many months exactly … 🤷‍♀️🤦🏼‍♀️🤦🏼‍♀️ when does month 7 start? Can anyone break down the months for me ?