sex help kind of

okay i know this is a really weird question but please bear with me. my boyfriend and i tried oral and he came in my ass but as we all know it doesnt stay in there so i ran to the bathroom to clean up and i was scared that some might have went into my vagina so i put my finger up there just to be sure but im scared that my finger might have had his cum on it and i just made myself pregnant. pleasehelp.