Carrying heavy things while pregnant.

I work in retail and it requires a lot of walking and carrying, pushing, pulling of heavy stuffs. I'm currently pregnant going to 8 weeks. I'm feeling better than when I'm at week 5/6. Should I still be cautious and avoid doing all those things? I'm pregnant for the first time. It kinda kills me asking ppl for help when I feel like I can do it but at the same time I don't want to regret my actions if something unfortunate happens.