I had a sexual intercourse 3 days before my period. the next day, my v. discharge seems to be normal 'coz it's white and watery. on the following day my discharge seems to be very watery and with unusual smell, then when i pee again, i saw this thick and light green discharge on my underwear. It's my first time to have that discharge and had it for 2 days coz on the next day, i had my menstruation but  I just want to ask if still need to go to the doctor to know why i had this kind of discharge.. I really had no idea about it.