TMI- What is this discharge?

Ja
I just had my first baby in June. I had unprotected sex and the next day had fertile cm. lately I've been lightheaded, have felt sick and have had a rather dull headache, supply decrease and my boobs feel clogged but they aren't. I don't remember what my first discharge was when I found out but I've been pretty dry down there prior since I'm ebf, it's been more wet with a white creamy discharge and today this came out. Did anyone have this before finding out they were pregnant again. It looks and stretches just like my mucous plug did..