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There are three primary ways a pregnancy can occur after a vasectomy: 1  Having sex without contraception before the manâs sperm count is confirmed to be zero. 2  Natural reversal, also known as recanalization. 3  Surgical error.
== Answer == There are a few cases where the vasectomy was not done properly and the male would not know for sure. It happened to a girlfriend of mine. Her husband got a vasectomy and they thought all was well and 3 months later she was pregnant. He had to have the vasectomy done again and this time properly.