I'm Absolutely Terrified 😪😪😪😪

I'm 16 with severe anxiety. 

A day before my actual ovulation day with a 33% chance of becoming pregnant my boyfriend and I saw each other. Sex has never been a thing for us and we don't plan on letting it be a thing for quite awhile. The only thing that I can think of that could have gotten me pregnant is precum on my boyfriends fingers. He never ejaculated near me, just precum possibly on fingers because he would masturbate and then touch me. We were very cautious for the most part it's just eating my mind and I'm so scared😩😩 my one nipple is killing me but it might be from him and my boobs are always tender before my period but not this early. Am I just overreacting? This happened on the 31st.