The anal swelling is not the implantation, there will be no special uncomfortable symptoms during the embryo implantation period. Occasionally, some pregnant women will have a transient pain in the small abdomen, which is mild and will be relieved after rest. It is normal to experience early pregnancy reactions such as nausea, vomiting and weakness as the pregnancy lengthens and a large amount of human chorionic gonadotropin is secreted in the body. If no gestational sac is seen in the ultrasound examination, the value of human chorionic gonadotropin can be taken for a blood test.