Does missed period after taking Z pack mean pregnancy?

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The fact that urine pregnancy test is negative, and as this is the first time that your menses have been delayed and there is a likely cause present- the throat infection and the stress factor during this month. So, stress as we know that it can easily cause hormonal imbalances which can delay menses, you are likely experiencing a stress delay. As you are already delayed by 10 days you can either opt for a withdrawal bleed with Progesterone now or wait for a week to allow menses to return naturally and if not, then use Progesterone pills for withdrawal bleed to initiate menses. Please maintain a menstrual calendar for the next three months to understand the pattern of your menses and to ascertain the need for treatment of oligomenorrhea.

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Yes, of course. There is no pregnancy as all urine pregnancy tests with different brands are negative. Urine pregnancy test is highly sensitive after eight days post missed periods. So you can be rest assured that the delay is likely to be stress induced.