What Causes Smelly White Discharge After An Unprotected Sex?

Hi, I have something to ask. I have searches ALL over the internet but havent came across anything too helpful. I am15 years old and sexually active with my boyfriend. One day after unprotected sex(withdrawel method) I started getting an itchy feeling and it would burn when I peed. It only lasted two days. But I started noticing a white discharge that wasnt normal. It smelt bad, and id wakeup and.it would just soak me. My boyfriend and I havent done anything since then bc we are unsure of what is and the smell is terrible. I looked it up and I came across a yeadt infection.. But thing is,.i have had sevre cramping since. Its hard to even sleep.its been about four days since we have had sex. I also came across a bv (bacterial vaginosis) if that can be the case. I cannot go to the doctor because my parents arnt aware im.sexually active at only 15. So I cant.ask to take me to the docer.. Do they have places like clinics to get checked out for free? Please let me.know what you thinkk it can be and your opinions. Oh and p.s me and my boyfriend are both std free. We lost our virginity to eachother.. thank.you