Career Change, but Pregnant

I'm no longer satisfied by my career choice (banking). I went to school for museum studies and history, and I want to make the switch from museum volunteer to an employee. But the thing is I'm about 11w. Do I stay in my current job until I depart for maternity leave? I just hate going to work. I feel like I just go through the motions. Not sure I'll make it until October... But to job hunt, secure a job, and then leave for mat leave withing a short time span? Is that wise? Ugh, I'm just so sick of where I am career wise these days.