What should I do?

Started my job about 9 weeks ago, am 7 weeks pregnant its home care worker but I work long hours driving around all day some of my clients have begun to get too heavy and keep pulling out of me and wanting me to put things under beds and on top of wardrobes and not only personal care like helping people but also housework some people give me lists which is fine but they dont realise I'm pregnant I dont want to tell my agency because I'm only new and I dont want them to think bad of me but I also dont want to damage my baby as I lost a baby back in July but just unsure I was hoping to wait till 12 weeks but with these heavy patients I'm thinking of telling them early ?? Advice please

Honestly could this be harmful on me I'm just afraid of them holding onto me and falling and taking me with them or hurting themselves as I cant support them like a non-pregger can yeno ...

Please help...