Most women usually have no obvious self-conscious symptoms when the fertilized egg is successfully implanted, and there is usually no physical discomfort. If the inner thighs are sore and swollen at the same time as the fertilized egg is successfully implanted, it may be due to the hormonal changes in the body during the process of implantation, resulting in pelvic congestion and stimulation of the surrounding tissues, which makes the thighs sore and swollen, but this is not common. Soreness in the inner thighs may be related to muscle strain, joint inflammation, femoral head necrosis, pelvic inflammatory disease, pelvic effusion and other physical abnormalities, which require timely medical attention and targeted treatment, and may be prioritized to general surgery or orthopaedics, to rule out joints and muscle lesions. If it is clear that conception has already occurred, the doctor should be informed during the examination to avoid unnecessary imaging tests and to avoid the embryo being affected by radiation. If you are pregnant, you should rest, avoid strenuous exercise and sexual intercourse, and follow the advice of your obstetrician/gynecologist for regular checkups.