*tmi alert*

Just wondering is anyone has any advice or has had any similar experiences-
Im currently cd 19/27, usually my periods are very regular (heavy but regular)
Last night while DTD it felt a little uncomfortable, I then noticed I was bleeding it was quite alot and was bright in colour. I have never had this before! Will be going to see gp this week but am really stressing about things and google is making it worse!
TIA