Def talk to your ob. Mine had told me norco and Tylenol w codiene was ok to take for my severe non stop migraines but I declined. That was in my first trimester so it might matter how far along u are. Is your leg recently broken? I cant image only Tylenol for the pain. Hope you get relief soon.
Depends on how far along you are but opioids are safe if done in a controlled way in general. If you are getting close to birth then baby can become tolerant and get withdrawal if your using them regularly. Talk to your primary care doc.