You expect your Dh to know that even though you didn't say anything you expected him to know you wanted American cheese from the grocery store. (My friend just told me tonight she yelled at her Dh for this lol she's 7 weeks)
You know you're pregnant when you have to force feed yourself because starving yourself and your baby is not an option no matter how sick you feel.
You know you're pregnant when you can't do major shopping without stealing a bottle of water half way through and paying for it at the end. (I did that last pregnancy almost every week for the last 10 weeks or so)