Her period usually changes a lot but this time it won't seem to start

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Impossible to comment from such scant information.

When she is 2 week late, she can do a pregnancy test with first urine of the moring

If a girl is late on her period and has a weird feeling in her stomach does it mean she's pregnant?

Maybe.

If she has had sex, then yes it is. She will need to wait until she's 14 days late and take a pregnancy test with the first urine of the morning.