need advice - recently lost my virginity!

hey so i've been with my boyfriend for about 8-9 months, and i'm 14 and he's 17. i knowww this sounds like a huge age difference but i really do love him and i know he loves me and mi family loves him and all that. sooo i recently lost my virginity to him, but we didn't use a condom. he didnt cum in me, and right after we drove to cvs to get a plan b pill. the thing is i checked right after and realized i am in my fertile window, which worries me... do you think i'm too young to be having sex ( keep in mind this is a guy i love and trust), and do you think i might be pregnant?