WHAT DO I DO

sooo this past wednesday (3/3) my boyfriend and i had sex w out a condom and he ended up finishing in me....(which we have never done before) but then the next day, thursday (3/4) i thought it was friday and that i had missed a dose (i was driving and trying to focus on the road) so i called my sister and she told me to take both pills at once. after i did so and i got home i noticed i had taken fridays pill as well and started to freak out. my sister said i should get plan b as soon as possible so i’m going to go today but i’m not sure what to do about being behind a day for the pill