1.0inviTRAhttps://www.invitra.com/enrich600338<blockquote class="wp-embedded-content" data-secret="1gL7uYgPTC"><a href="https://www.invitra.com/en/one-week-pregnant/">When does week 1 of pregnancy start? – Are there any symptoms?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.invitra.com/en/one-week-pregnant/embed/#?secret=1gL7uYgPTC" width="600" height="338" title="“When does week 1 of pregnancy start? – Are there any symptoms?” — inviTRA" data-secret="1gL7uYgPTC" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://www.invitra.com/en/wp-includes/js/wp-embed.min.js </script> https://www.invitra.com/en/wp-content/uploads/2018/02/first-week-pregnancy-symptoms.png24001020The first week of pregnancy corresponds to the beginning of the menstrual cycle and the beginning of the menstrual period. Fertilisation of the embryo has not yet taken place. The most common symptoms in the first week of pregnancy are bleeding, abdominal and ovarian pain, cramps and/or fluid retention.