I am Office going women .. from when can I take maternity leave ?

Taking maternity break completely depends on personal preference. You can work even till your due date if your pregnancy is non troubling. But I would recommend to take a break one or two weeks prior to due date. That way you will get enough time to relax, de-stress and focus on your delivery. However, if you have too much of travelling, or have a physically and mentally draining job then you may decide it for yourself and start the maternity leave from next month onwards.