Hi, I'm 18 Years Old And On Monday I Had

Hi, I'm 18 years old and on monday I had unprotected sex with my boyfriend who is 25 around 12pm. I'm not on birth control, and he didn't use a condom. He pulled out a good 5 seconds before he ejaculated, and he said I would be okay. I freaked out for the rest of the day, so on tuesday I had him drive me to CVS to buy Plan B. I took it around 9:30am, and we had sex again. I'm scared that I might be pregnant. I'm not receiving any side effects from the pill, and I know it doesn't effect everyone in the same way. I know that my period isn't supposed to come for another week, but I'm terrified.