If you truly have inverted nipples, they will not protrude out, ever. It sounds like you have flat nipples. I have them too. Flat nipples are much more common and easier to fix. Alot of doctors say women with flat nipples will naturally have them fixed when they get pregnant, which I'm 7 weeks and they won't go back flat again. Don't worry about your nipples going in or out, that's what flat nipples do, it sucks, but I've had it all my life, and it's no big woop. Good luck and HTH!
I would go to your dr just to make sure, better safe than sorry:)