Plan B 4 hours after unprotected sex

Hey guys, first time posting on this..I blacked out and woke up to having unprotected sex, I’m not on birth control and the guy came in me. I took plan b 4 hours later after what happened. It’s 3 days later and I have no appetite. Is this a symptom that most people have after taking plan b? Not sure what to expect but I’ve been off my bc for one month so my cycle is irregular. I can’t afford to be pregnant, especially with the creep who did this to me...any thoughts or doctors out there who can give me pointers? Thanks.