Help needed what should I do

I was not taking my pills at a regular time then I missed three days. I started to bleed a little and once I relived I took two of the pills that I missed right away. Then today i took another two to get back on track. I ended up having sex with the guy today twice. He pulled out but I’m still considering buying plan b what do you girls think I should do? I’m in college and CAN NOT afford to be pregnant.