Possibly - but it's not a symptom I've ever heard of
That is one possible sign of pregnancy. Take a pregnancy test if your period is late.
No.
Yes it can. It is normal hun dont worry. As long as it is not puss or blood
You definitely could be pregnant. It might also be a sign that your period is coming soon. Or you might want to et your breasts checked up on to make sure you don't have an infection or anything.