3) Without prejudice to the provisions of section 6,no pregnant woman shall,on a request being made by her in this behalf,be required by her employer to do during the period specified in sub-s.(4) any which is of an arduous nature or which involves long hours of standing,or which in any way is likely to interfere with her pregnancy or the normal development of the foetus,or is likely to cause her miscarriage or otherwise to adversely affect her health