okay so im 15 ( 16 in april ) and when i first began puberty my nipples didnt properly come out, like they were triangular or soft but recently they have been tingaling or have been quite sore ( not bery sore ) and my nipples seem to develop to longer ones. yes ive had sex.. but this cant be a sign of pregnancy..but its so weird and most of my friends say theyre nipples are already proper... help ?