Day 3 of Placebos & No Period Yet

3 days into my placebos & still no sign of AF! i still have 4 more sugar pills left in my pack. last time i had sex was last Thursday (only time i had sex during my entire pack). my boyfriend also pulled out. i'm also very anal about taking my pill so i'm 99% sure i haven't missed/skipped any. do you think i'm good as far as pregnancy goes? since i still have 4 more days of placebos to take, should i just wait it out? i'm so nervous lol 🙈