Not only is it possible that you can be pregnant, it is also possible that it could be a tubal pregnancy
. Please return to your doctor and have a blood test
that counts how much pregnancy hormone is present and follow that out until you and your doctor know where the pregnancy is located. No method of birth control is 100%. The body tries to restore reproductive potential. Though it is rare sometimes the tubes succeed. When I have a patient who has become pregnant after tubal ligation
and desire sterilization
I then removed the tubes in their entirety. I am sorry you've had this unexpected outcome. I hope that it resolves safely and soon.