Ob-Gyn questions? Ask a gynecologist online.
generally period can be absent for two reasons, hormonal imbalance or pregnancy. So I woud recommend a urine test, if the result is negative, your girlfriend should wait and see, only if the bleeding will not occur during two weeks, a checkup by OB/GYN would be necessary.
Dr. N. Scheufele
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Thanks a lot, all the best for you,