Hi, I Am 15. I Am Scared I'm Pregnant...It Has

Hi, I am 15. I am scared I'm pregnant...It has been about two weeks since me and my boyfriend were sexually active. About three days after we were I got sick with a sinus infection which is not uncommon for me. I get them about twice a year. With them usually comes nausea and a yeast infection. I'm also no stranger to yeast infections and tend to get them often. I have been on birth control for about two months now. I am still on my antibiotics. Also, still fighting my yeast infection. My boyfriend and I had not plan to have sex and he did not have protection. It is not the first time this has happened. He always, for lack of better terms, "pulls out". And I've never had any pregnancy scares before. But this time is different. Here are my symptoms : Indigestion, nausea, and usually thick "cheesy" discharge. However, today the discharge was light brown which I know can be a early sign of pregnancy. I did miss a birth control pill yesterday and I know that can cause spotting. I am a straight A student in 9th grade an officer in a school club with great parents that would be terribly disappointed and mad if I turn out to be pregnant. I'm not a "bad" girl. I never get in trouble have sex is really the only thing I do that is not good. I don't drink or smoke and am a weight lifter and cross country runner. I would really love a professional opinion on my problem. Thank you.