What Causes Soreness In Breasts And Acne After Having Nuvaring?

Hi I have just started nuvaring and I absolutely hate it. I have awful side effects, massive sore breasts, terrible acne (none of which I have normally & I also had these side effects on the pill so I know its from hormones).I want to remove this ring asap but am worried about getting pregnant. Ive had it in for 12 days now& put it in on day 6. I had sex 2 days ago (he came inside me). Please advise if I can remove it now without becoming pregnant. I will not use another hormonal BC method. Thank you!