Im not sure if you keep track of things that are going on in your body but my nipples and breast are always sore after i ovulate up until my cycle start. When i was preggo, the pain was different, it was more tender to touch but also sore. If you dont keep track of symptoms thats going on in your body its hard to say why your nipples/breast are sore.
It's not likely that you are pregnant, but there is always a chance even with protection. I first felt the symptoms after two weeks. Every pregnancy is different though. Wait until you actually miss your period and take a test. Good luck.
yes she can, however.... your boyfriend didnt *** inside you did he?
and most of the time you used protection?
what time of your cycle was is in relation to ovulation?
i think it would be very very unlikely although not mpossible and maybe your breasts are sore due to pms?
take care x