mrs b2007,
It's very possible that pregnancy has occurred. In this case your best bet is to see your doctor for a blood pregnancy test, as this is the most accurate way of testing. Typically the best time to test is at least two weeks after a missed period. Other reasons for period abnormalities include stress, weight gain/loss, thyroid, hormonal imbalance, infection, illness, medications, polyp, cyst, amongst other reasons. If the blood pregnancy test comes back negative, your doctor can do further testing to determine what the exact cause may be.
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