This is the first time I've had a pregnant sim since the November patch, so I encountered this too. My sims are in the culinary and tech guru careers. After they received the notification that they could take family leave, I checked the phone and there was no option for it under the work tab.
I checked the tuning file for this phone interaction and there seems to be this erroneous section under test globals:
<V t="career_test">
<U n="career_test">
<V n="test_type" t="career_reference">
<U n="career_reference">
<V n="career" t="specific_career">
<T n="specific_career">189135<!--career_Adult_Active_ActorCareer--></T>
</V>
</U>
</V>
</U>
</V>
With that career test in there, it means that the family leave option will only show up on your phone if you have the actor career from Get Famous. For everyone else, it would make the option disappear.
I made a mod which changes this section, and when I tested it in my game my pregnant sim and her spouse could now use the phone to take family leave again. If anyone else wants to test this too, I uploaded it to my wordpress site, which you can find if you google for my username and "wordpress" or "facebook".