PLEASE HELP ASAP

my boyfriend and i have an foreplay but We didn't have sex. he cum out side in my upper body also in my hair so its alot of cum but not too alot . then he grab his towels to dry cum on me after that . i am take a bath then after taking a bath im confused if he dry of all cum on me then, he says he don,t know now ? can i get preganant of that we realy don't know if all of the cum on me is dry. then maybe thier cum on me and mixed by water Could the sperm have traveled through shower water landing on my vagina making me pregnant?