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You can take medicines to postpone your periods, but it is not advisable as it will interfere with your hormonal
balance. Avoid taking medicines to delay your periods as far as possible. In case it is that important you may take the medicines, but it should always be under medical supervision, so that if any complications arise, you will have a responsible person to attend to your problem.
is not an absolute contraindication, but better to avoid delaying pregnancy
Wish you all the best.