the internal os is an opening of the cervix where it joins the uterus. it should normally be closed.<br> placenta reaching os means the lower end of placenta is reaching this point. it leaves very less place fr a baby to position itself in tbe lower part of uterus. potential complication is bleeding.

can you help <font color ="#3b5998"><b> @616d51e8ca67e40013aa9222 </b></font>