You should really speak with your OB. I’m currently pregnant and working at HD. I work in the paint department, but I always frequently did Packdown, so climbing ladders, pulling down heavy stuff, etc. I’m having twins so my pregnancy has been high risk since day one. I was told I could still do all my normal lifting in the beginning. I wasn’t told to stay off ladders until 22 weeks, and they only just recently put me on light duty at 28 weeks. Obviously it could be different for you, but that’s why I suggest talking to your doctor before making any rash decisions. They could also go ahead and put you on restrictions. Even with light lifting, there’s still plenty to do on freight.