Typically, your breasts start to develop about 2 years before your period begins.
No you get breasts first
Maybe it is because you are growing in stages. First your period, then your breasts.
Sore breasts before period is normal. If you miss your period, take a test
Women have different size breasts. It is based on genetics.
No.
The cramps and enlarged breasts are signs of period, but with nausea it is more a sign of pregnancy
Yes. The same things happens with my girlfriend. Her breasts become very sensitive a few days before her period.
If your pregnancy test was negative, you got your period and your breasts are sore it could just mean that they're growing. Breasts can also be sore or tender during your period.
Your period may beggining or they are growing
Yes, or right before their period.
Maybe, but my guess is that what you describe is part of the period. Breasts are often sore during and after a period.