Trying To Conceive. I Had A Period On The 27th

Trying to conceive. I had a period on the 27th of july. We've had continuous sex since then. Now today august 23rd I'm all of a sudden having extremely light brown stringy disharge with creamy white disharge with it. Not heavy. No cramps. Never had this before. I've had 2 babies but didn't experience before. Took a pregnancy test yesterday the 22nd and it was negative. Not sure what is going on?