Please anyone answer:

Hi... me and my boyfriend had sex last night and the condom broke after at least 10 to 15 min. since we started... he had Not ejaculated yet.. but we are not sure if he lubricated, and are worried if something might have slipped even though he hadnt come yet. (he then used a new condom till he finished) ... I was thinking of taking the morning after pill, but after some research i saw all the side effects and negative feedbacks from other women, and im not sure if i should take it or not. Should i take it regardless of the severe side effects? Or does anyone think its not possible that i could have a chance of becoming pregnant? { by the way i finished my period about a week ago... am i in the most vulnerable time? }