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Do a pregnancy test with urine pregnancy kit. If it is negative, wait for the period for at least seven to ten days. If the period does not come repeat the test and then think of taking medicine to bring period, not before that.
If the pregnancy test is negative, there is no harm in waiting for the natural onset of period. In most of the cases, period comes naturally. Otherwise, you always have the option of medicine.
For more information consult an obstetrician and gynaecologist online --> https://www.icliniq.com/ask-a-doctor-online/obstetrician-and-gynaecologist