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If unprotected intercourse
did take place then there are chances of pregnancy
and if no contraception
is practiced then the next best step is to get a urine pregnancy test done .
The fact that she has had some bleeding and no other symptoms might not rule out pregnancy as during the first two months or so there can be some bleeding or spotting and not every female has nausea
If this was a protected intercourse then the chances of pregnancy are very rare however the safest thing to do is to get her tested anyways . Considering she is a minor you might confide in a close adult relative or friend to guide you if needed.kindly practice safe sex in future.
Hope this answer is helpful to you.
Wishing you both good health.