Hi there
Dont worry about this you will soon start to find ways around it! Not all surgeons want you to wear a bra for the first 6 weeks and its not always the best things to do. You can get nipple covers (doesnt sound great) from places like la senza and M&S, try these out. they will come in handy after when you want to wear backless dresses ect!
i tried a bra a few weeks post op and felt uncomfortable for the first few times so if you do decide to wear a bra make sure you take your time and dont just into a sports bra for a long period of time!