Abnormal Discharge..

This is going to get pretty in depth with details and might be a little gross.. my period is very irregular and the flow varries. I was taking birth control the last time me boyfriend and I had sex. He came in me but I pushed out what I could and cleaned up. Well, a few days after that I stopped taking my BC. Today I got home (a week or so after not taking BC) and there's this extremely stretchy and thick, stringy discharge. It was clear in some parts and a little bit foggier in others.. I have never had this before. I do have a picture but I don't want to post it unless I have to... what is this stuff!? HELP!