If your cycle is 28 days then you would have expected a June period in the last couple of days.
Early testing in pregnancy can give false negative readings, so do a home pregnancy test now with early morning urine and it may be worth waiting a couple of days and doing another test. Or ask your doctor to run a blood sample as this is more accurate.
Assuming pregnancy has definitely been ruled out; there are a number of other reasons for late or missed period.
These include hormone imbalance, Polycystic Ovary Syndrome, thyroid problems, stress, being underweight, or being excessively overweight, losing weight very quickly or exercising excessively.
In order to get an answer re hormone and thyroid you will need to request blood tests for these from your family doctor. The lifestyle factors can be looked at and changes made at home/work to reduce stress etc.
Your doctor will also want to hear about any other symptoms such as unwanted hair, mood swings, thinning hair, tiredness etc.
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