Discharge?!?!

Hi I'm 19 years 
And I was wondering what I could have? I had birth control inserted for a a year into my arm but had it removed five months ago. Since then I haven't gotten my period and I'm starting to get white discharge on my panties. It doesn't smell but I never used to have this. It so much that it wets my panties and sometimes it comes out yellow and sometimes white and leaves it on my undies. But I do have sex and it's starting to effect my sex life. Because my boyfriend loves to eat me out but he has to stop bc He said that white stuff is coming out. Please help!? Ik I shld go to the doctor but I would like to have some idea of what I might have.