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Normally placenta attaches to upper uterine segment .It will not interfere during delivery . When placenta in the lower segment than it is called placenta preavia, having various grades depending on the close proximity to internal os or opening of cervix
.Low lying placenta will recedes as pregnancy
advances so it will be away from os .
Yes you take rest ,avoid heavy weight lifting , coitus,constipation
Yes you can do light house hold works.
Go for regular USG,to laocate placenta.
Thanks for querry.