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Period normally starts within a week of finishing Meprate (Medroxyprogesterone) tablets. Rarely it can take 15 days for period to start. If it has been more than 15 days since last dose, you need to visit gynecologist to get one ultrasound done, as Meprate will be effective only if your endometrial thickness is good, ≥ 7mm.
If it has been less than 15 days since last dose, you can wait. If there is strong suspicion of pregnancy no harm will be done by repeating pregnancy test. Meprate will not induce period if you are pregnant.