Joanne, its actually old wives' tale.. Basically, i changed my bedsheet, move my bed and sofa out to vacuum the dust below for the whole 9 months during my no.1 time and my no.1 is a notti little boy now..
Now preggy with no. 2, i also gotta wash toilets, do housework, yesterday also just shifted my sofa to vacuum cos found a dead cockroach and last week also changed my bedsheets and my boy's bedsheet..
Just take those old wives' tale with a pinch of salt but in a way, its good to get hubby to do it...