convert the & with %26
For Example
<span class="share"><a id="whatsapp" href="https://api.whatsapp.com/send?phone=&text=वृष www.shubhcalendar.com/sign-detail?id=2%26utm_source=web%26utm_medium=in" data-action="share/whatsapp/share" class="social-share-url.whatsapp" target="_blank">
<img src="/image/whatsapp_50.png" alt="">
</a></span>