I NEED HELP

I am so so so afraid right now and need some advice. I'm not on birth control and have had sex but had to take emergency contraception. The bad thing about this is I had to take it 3 times within the one cycle and I know how stupid that was but I had no other choice! I know that it is unbelievably bad for you but I couldn't risk getting pregnant. My period is now 6 days late and I can't even afford a pregnancy test so I'm freaking out. I know it can make your period late but does anyone know if you take it more than once in the same cycle if it a still prevents pregnancy?