I dont know what to do

My fiance have a gambling problem he play poker at friends house every Wednesday Friday & Sunday but I don't like it cause he be there from 8 to 6 in the morning every time Im currently pregnant with twins and doctor told me not to do much or they will come early but of course he not helping with anything its gotten so bad he picked a big argument in order to go so I'm asking should I stick it out or just leave