noimer,
If pregnancy would have occurred, you would have initially missed a period, and experienced implantation bleeding. Implantation
bleeding occurs a bit earlier than expected, and it is scanty, spotty,
pinkish and not red and heavy like a period, and does not follow the
normal pattern of a period (light to heavy to light). If this sounds
like what you experienced, then you need to see your doctor for a blood
pregnancy test, as this is the most accurate way of testing. Other reasons for period abnormalities include stress, weight gain/loss, thyroid, hormonal imbalance, infection, illness, medications, polyp, cyst, amongst other reasons. If the blood test comes back negative, your doctor can do further testing to determine what the exact cause may be.
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