Is there anything I can do to help regain sensitivity in nipples?

Thanks for reaching out.  It is very common to have alterations in your nipple sensation in the immediate post op period after breast augmentation.  If you are slowly regaining sensation I would say you have a good chance of returning to normal.  It may take up to 3-6 months, and even some cases 12 months.  I would say whatever you sensation is after 12 months would likely be what you are left with.  Since you are only 3 weeks post op you have a lot of time to go.I hope this helps :)

It sounds like you are on your way to recovery. There is nothing to do to speed the process. Best wishes.

If you are regaining sensation, then that is a good thing. Often it is due to swelling and if improving this quickly, it will likely improve more over the next several weeks. Best of luck.