Lying problem

So my husband since I met him has always told lies, whether they're small or big, although to my knowledge he's never cheated. Now I'm always irritated at the things he does and don't really believe what he tells me, I kept telling myself he'd change it to fix this relationship but its been almost a year married and I'm 15 weeks pregnant not thinking anything will change and that I've made a huge mistake. I'm so lost with what to do