Hello:
What you are describing is normal for many women. When a woman has taken the pill for a while the body becomes "accustomed" to it, so to speak. When the pill is stopped, the body has to go through another adjustment which is what we consider to be normal. The adjustment phases for each of these involves the hormones. Though some women seem to shift back into a regular rhythm or cycle others will vary.
Regarding a possible pregnancy: The self tests are better now than they have ever been; however, there are factors that do effect their accuracy. Shelf life and improper storage (extreme heat or cold) are the two most critical. It is virtually impossible for a consumer to know either of these. Though expiration dates are provided to inform the consumer of the longest amount of time they can rely on a product to function as described on the packaging they are ineffective if they have expired at the time of purchase or if the carrier had a lay over in Texas for a week with temperatures remaining in the low 100's the entire time, while their truck is not refrigerated.
To effectively rule out a pregnancy, it is in your best interest to see your OB/GYN doctor and have this confirmed. With a bonus of knowing that you have established good health care for you and your baby if you have conceived.
It is also suggested that you see your doctor because if you are trying to get pregnant and aren't already he will most likely ask you to wait for a few months before trying to ensure a healthy environment (your body) for your future baby.
If you are feeling alright and can remain calm Images available only to Customers.