Most of the time when you miscarry its not cuz of anything you do, the primary cause is genetic malformations that aren't conducive to life. Heavy lifting won't cause a miscarriage but as you get bigger it can cause back problems. Other things that can cause a miscarriage are accidents/ trauma or severe acute infection... You do need to watch what you eat though.
just like she said i was told the same thing cant carry any heavy objects reduce some activities such as jogging etc also some household chores take it easy on products that can be toxic while cleaning thats all...:) everything will be just fine if u take those small precautions
i just fount out i was pregnant on saturday this would be my third baby im 6 weeks dont be sacared what they mean by that is to not carry any heavy things you cant run or jump just heavy things like that you know but its nothing to be freaking out of :)