unfortunately, yea you can get pregnant just 3 days after your period. it happens more often then you might think. BUT, the best thing to do is to stop freaking out before you even know whether you’re pregnant or not, then go to the store and get a test. If it comes out pregnant, DO NOT hesitate to tell your parents. 1) the longer you wait, the harder it’ll be, 2) the longer you wait,the angrier they might be once you tell them 3) the sooner you tell them, the sooner you can figure out a plan
this will be very scary and difficult, but you’ll get through it. if you need someone to talk to, let me known:)
good luck