trinsmom,
It's possible that it could be your body getting used to not being on the hormones anymore- it usually takes a few months for your body to get used to not having the hormones anymore. As nothing is 100% effective in preventing pregnancy except abstinence, it could also be possible that pregnancy occurred. If the 2nd period was not normal, it's possible that it could have been 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). Other reasons for period abnormalities include stress, weight gain/loss, thyroid, hormonal imbalance, infection, illness, medications, polyp, cyst, amongst other reasons. If you feel you may be pregnant your best bet is to see your doctor for a blood pregnancy test, as this is the most accurate way of testing. If it comes back negative, your doctor can do further testing to determine what the exact cause may be.
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