Hi I'm 19yrs Old..i Had Sex 4 Days After My

Hi i'm 19yrs old..i had sex 4 days after my periods...he had not ejaculated inside me...bt since we both were not sure and the condom had broken i decided to take ipill...i had it aftr within 13hours...now i notice that i have vaginal bleeding exactly on 6th day after taking the pill...is it ok or should i be worried?...my menstrual cycle is irregular since last 2-3 mnths.