Thank you for sharing your question with the EmpowHER community. I understand this might be confusing for you. I hope I can be of some help.
Irregular periods can be linked to thyroid problems. Have you experienced irregular periods in the past? A few irregular periods a year are usually nothing to worry about, but I advise you to contact your doctor.
Since you mentioned that you have not had intercourse, then there isn't a possibility that you may be pregnant.
I hope this helped ease your worry.
Will you contact your doctor? Please take care.