No, it is not the norm, but it happens. Generally a tubal ligation, or vasectomy for that matter, is considered permanent... and in most cases they are. Depending on how your tubal was performed, the odds may be greater for a possible regrowth which may result in pregnancy.
Have you seen your doctor about it? Has the pregnancy been confirmed? If not, do that first. If you are indeed pregnant, they will likely want to do an ultrasound to take a look.
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