Hello,
Chances of pregnancy are less in your case and the symptoms can be due to hormonal imbalance.
Hence to confirm the status of pregnancy, I suggest you to test for pregnancy by a highly sensitive pregnancy test 10 days post ovulation with a sensitive ( 20 - 25 mIU ) pregnancy test. Also then I would suggest you to get your serum HCG levels estimated since this is more specific than urine for pregnancy tests.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
No one knows your body like you do but here is my experience.
I was on the same bc for 6 months before stopping for a month and a half. I had my period during the time i was off my bc.
Once I decided to get back on the pills I started my period AGAIN, a very short time later. I just chalked it up to the fact that my body had gotten used to the hormones the bc was putting in body and that my body was just thrown off by the lack of the hormones.
Everything returned to normal after that scary incident and it hasn't happened again.
Best of luck and seek professional help if you feel you need it.