Working 50+ hours a week at 32+ weeks?

I work in a factory where I'm constantly lifting and on my feet. I have to start picking up loads of overtime due to no maternity leave savings and I'm due on February 5th. I'm 32 weeks this coming Wednesday and about .5-1cm dilated (as of 28 weeks, I'm not sure if it is any different now). I just want to make sure it would maybe be safe to work at least 20 hours of overtime? I am considered high risk due to 3 losses and the early dilation. My boyfriend isn't helpful with money even though we make $43/hour (before incentive which usually runs us anywhere between $47-50/hour) together and bills aren't even crazy high. But I've been the only one buying baby stuff and just had to cover rent by myself. Can't even do Christmas this year but anyway, is 50+ hours a week okay for 32+ weeks pregnant?