Bleeding and horrible pains

Lexy

I’m 27 weeks and yesterday after me and my SO had sex there was light pink blood on the toilet paper. Now I have had horrible pains all day long that won’t go away they start from the front of my stomach and shoot around my left side and through the left side of my back and nothing relieves the pain and it won’t go away.It started last night. Is this normal or something to be concerned about