Hi.
Interesting situation there.
First, goodluck with your wedding.
If you have four days counting, that would mean that your period should be gone by saturday atfernoon.
What is your cycle like? That can determine how long your period can go. At what time of the day did you begin your period? How heavy is your flow?
You need to have these answered to find answers.
What you can do for now to have more release, is do regular floor exercises after taking a warm cup of black tea. Preferably herbal tea. Do floor exercises atleast twice a day and massage your lower belly (abdomen) with warm extra virgin oil. However you can use other oils. Massage in circular motions around your belly and then take a brisk walk.
That will get you feel light with less cramps and get the flow heavier which elimianates the blood faster from the system.
However this works well knowing answers to above questions.
However you should also put it in mind that if you and your husband to be have tested for hiv, then you can have sex on 19th march. The flow may be very light and unnoticeable or you could have finished your period by then.
Good luck