I had sex this morning and there was light red blood then, and I came back in the evening and it was like this on top of my underwear.It's sticky, like a mucous membrane.Period should be on the 13th
According to your description, it is recommended to go to the hospital for examination. Vaginal bleeding after sex is mostly seen in cervical diseases, such as cervical intraepithelial neoplasia, cervical malignancy, cervical polyps, but also cannot exclude menstrual abnormalities, ovulatory bleeding and other such cases.
The most common cause of bleeding after intercourse is cervical contact bleeding. It is recommended to have a cervical screening, including cervical TCT and HPV testing.
The bleeding after intercourse is contact bleeding contact bleeding, celiac disease is more likely, you should let the doctor open the vagina with a speculum to look at the cervix to confirm the diagnosis, if there is celiac disease need to do a cervical TCT and HPV screening after the bleeding stops.