What is it? confused...?

I Have been having unprotected for over two months now. I am irregular on my periods...And today while having , me and my bf stopped for a few seconds and he pulled out ( he did not *** yet) And well there was a white odorless thin milky discharge all over his from my ..THIS IS THE SECOND DAY IN A ROW....What could that discharge be? Should i be worried?? Am i ovulating? Std? lubricant? pregnancy!! If Pregnancy related how far in into pregnancy does this happen?? I have had a million times and never had this before.. Im not a little kid, i know about and i know i can get pregnant!