Contraceptives are comparable like guns or ammunition; as is the case with these items, contraceptives can be used for a legitimate purpose or used for vices and corruption. So even as everyone is not supposed to sell guns or weapons, not everyone should be allowed to sell contraceptives.
If you are choosing to sell contraceptives, you need to ask: Are people, in general, using these devices for a legitimate purpose or is it mainly used for vices and corruption?
If the latter is the case, then you better leave the business.
If you are in doubt, then also you might as well leave it.
The Prophet (peace be upon him) warned us against committing that which is doubtful, for it may inadvertently lead us to commit that which is purely haram. And by leaving the doubtful, we are better enabled to guard our honor and religion.
Remember there is always halal alternatives, if only we are willing to look for them.
I would advise you never to stop praying to Allah:
Allaahumma aghninaa bi halaalika an haraamika wa bi ta’atika an ma’siyatika wa bi fadhlika amman siwaaka
(O Allah, make us self-sufficient with that which is Halal for us so that we are not compelled to resort to that which is haram; make us content with Your obedience so that we do not disobey You. And make us satisfied with Your favor so that we have no need to look for favor elsewhere).
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