Concerned.

Alex
Ok so I haven't started my period yet (today I should've) and I usually have irregular periods. The thought of 'pregnant' is in my head. 
I don't take birth control because my mom will assume I'm having sex and I'll get in loads of trouble. (I'm scared to death of her) and my boyfriend and I have sex kind of often. We use pull out method or comdoms. He said there's probably 0 sperm In me because the closes its been to that is we had sex W a condom he came in and then like 20-30 mins later we did it again. He came once on the hood? Of my vagina. It was not on my lip portion of them but like right under where my belly button is but more close to the vagina top of you get what I mean. And idk I'm just nervous.  I think I haven't started my period BC of emotional stress BC my home life stresses me out and I have anxiety and depression so I'm stressed a lot. Please just can someone evaluate for me.