girls, I want your answers here. and be serious lol

 My friends are assholes and keep saying that my period is probably not even that. They keep saying that even if you're pregnant you can still bleed(yeah I know that one) but I'm pretty sure if you're pregnant you don't got chunks of your uterus lining comin out since it's kinda in use. Soooo you girls tell me, whose right. My friends, or me?