My fiancé's family has started getting involved in everything

We're getting married in two months, but to be honest, I've already started to regret it a lot. My fiancé's mom calls every day and meddles in everything from the furniture at home to the wedding dress; she finds something to interfere with everything. When I tell my fiancé, he just says, "It's my mom, don't break her heart," and he never defends me. I'm really scared that it will get worse once we're married; I don't know if I should break up.