If you are having light headedness, heart racing, etc. then I do think you need to see a health care professional as soon as possible. That would be my recommendation. I wish you the best and let us know what the doctor says, okay?
If you are asking if you are pregnant-- it is very rare as tubal ligation is considered permanent sterilization. However, sometimes scar tissue can form and sort of rebuild the tube. Important to get that checked as most times if that is the case, it is an ectopic pregnancy. So, please see your doctor.