Plan B and birth control pills😵

i’m sometimes irresponsible with my birth control pills and i had sex on this month where i missed two,

now i think it’s almost impossible for me to get pregnant for some reason, i guess i’ve just been lucky. but i took plan B and my friends told me to continue my regular birth control method. so i continued taking my daily pill, but i started spotting for two weeks! i just two days ago got my ACTUAL period. is this normal after taking Plan B? it was my first time taking it and i really think it messed up my cycle more :(