There are a few possibilities here. One of these is simply that your period is lighter than usual. When this occurs, it can sometimes make the color appear different. In particular, if there is less bleeding then you are used to, the proportion of the menstrual flow that is from shed uterine lining (rather than blood), is higher, changing the color a bit.
Another possibility is that you have some vaginal mucus or other vaginal discharge, which would be unrelated to your period, but which may be causing the change in the color.
Regardless, the best way to figure out exactly what might be going on would be to see a doctor
. You can make an appointment with either your primary care doctor
or your OB GYN doctor. They can perform a physical examination and determine whether there is anything going on that might require further testing or investigation.
Make sure to mention to them if you have any other symptoms, such as abdominal pain
or cramping, vaginal itching or redness, burning or pain with urination, and so on. These symptoms will help your doctor narrow down the potential causes of your symptoms.
Please make an appointment at your convenience.