Sore nipple and STD - Online Doctor Chats

User :   hello
User :   ............
User :   okay well if any one is there my question is this
Doctor :   hi
User :   hello
Doctor :  
hi
User :   okay...... so i have inverted nipples and am now sexually active and recently they have become popped out slightly and red sore and itchy and when i had sex the other day after i had a strange feeling right above my belly button...
Doctor :  
ok
User :   but i took a test and it said negative and now i have begun my period and its very very painful what could it be....
Doctor :  
what test u have taken?
User :   a pregnancy test just some dollar store one
Doctor :  
ok
Doctor :  
from how many days u were having inverted nipples?
User :   i was born with inverted
Doctor :  
oh ok
User :   but now they are kinda not so inverted but now full nipples
Doctor :   ok

Doctor :   u are infected
Doctor :  
with an STD