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If you missed your period which was to start on 28th July you can go ahead and do urine pregnancy test.
The test checks for levels of HCG hormone and the levels would be adequate at this point if you missed your period to give a positive test in case of pregnancy.
If you had your period at end of July it is too soon to get pregnant.
You would not have ovulated or conceived till now if you had your period on 28th of July.