Sterilization is extremely effective and is intended to be permanent. Nevertheless, about 5 of every 1,000 women become pregnant within a year after the procedure, and that small risk remains until menopause.
Get a pregnancy test if you are worried that you may be pregnant.
References:
- FSRH Faculty of Sexual & Reproductive Healthcare. (2014). Male and Female Sterilisation. RCOG, London. Retrieved from https://www.fsrh.org/standards-and-guidance/documents/cec-ceu-guidance-sterilisation-cpd-sep-2014/