Because they are different.
One reason could be, you may be pregnant and another reason could be PMS. Breast always tends to feel this way early in pregnancy and also PMS
Laughing for no apparent reason would make your friends dislike you and possibly make other students feel angry.
you could
yes sickness does not occur to all pregnant wemon
Spike in estrogen levels for some reason?
no
yes you could be pregnant.
you could be pregnant. take a test
If you are not pregnant and you feel your insides jumping around and can see it from the outside it could simply be a muscle spasm.
well i don't think it could be possible
It depends on why you or why she broke up with you. If you cheated - no If she cheated - maybe If you broke up with her for no apparent reason - yes If she broke with you - no