Hello and welcome, It is sometimes possible for recanalization to occur after vasectomy and pregnancy may be possible. But it occurs during the initial months after vasectomy and rarely occurs so late. Also you are still in the ovulation phase, so pregnancy takes at least 5-6 weeks to give rise to symptoms. The best way to know this is to get a semen analysis done for presence of sperms. If they are present then it indicates a failure. So most likely these symptoms are due to gastric trouble and stomach upset. Try eating yogurt and clear soups and take B complex vitamins. If the symptoms do not improve with this, you may need to see a doctor. Hope this satisfies your query. Thanks for using HCM. Feel free to ask any more questions that you may have. Dr Madhuri Bagde Consultant Obstetrician and Gynecologist