Ruling on selling contraceptive measures

I am a pharmacy student in my penultimate year at university. I am facing a dilemma regarding the permissibility of contraveption in Islam. I have read your answers and material from other sources and alhamdullilah it is very informative but unfortunately limited to contraceptive measures such as condoms, coils etc. As a pharmacist I will be faced with supplying patients with oral contraceptives such as the pill and especially the ‘morning after pill’. I cannot find the Islamic perspective on the last two contraceptive measures and especially the latter. I may be mistaken, but does it say in the Qur’an somewhere that Allah (SWT) enters the soul into the foetus after a particular period of time? If so, please could you give me an answer in light of this since many muslims condemn the use of the ‘morning after pill’ on the basis that it kills a living human being. Some muslims also condemn the use of oral contraceptives/’morning after pill’ on the basis that these drugs cause side-effects which may be harmful to the woman taking these but they fail to realise that EVERY drug has the potential to cause side-effects. Please could you give me an answer in light of the views expressed so that I can educate myself and other muslims.