DH sent of his first sample at 17 weeks (should have been 16 but he wrote it down wrongly - grr), and the result was rare non-motile sperm present.
He needs to do more tests at fortnightly intervals until two are clear.
Anyone been in the same boat? How long did it take you to get negative results? Especially if he had RNMS (which I understand means the vasectomy was successful as no swimmers getting through, but still not totally clear tubing; risk of pg apparently very, very low but they don't give the all clear on this).