Thank you for your query.
If you are having negative home urine pregnancy
test result, you are mostly not pregnant, as these tests are 97 % reliable.
Birth control pills are hormonal
pills, which you have been consuming, and after stopping them the body needs time to adjust to the newer hormonal levels.
the symptoms you are describing could be due to this effect.
Also, you might be pre menstrual and having PMS which also manifests this way.
your body needs 3 - 6 months to normalize and adjust to the newer hormonal levels.
Meanwhile, you can consult a gynecologist to confirm that this is indeed so.