How long do the symptoms of Plan B last??

I had 10 days ago on the last day of my period. I forgot to refill my birth control prescription the day before, so technically I missed a pill. (I have been on Yasmin for a year now, so my cycle has gotten very regular. So, I shouldn't have been anywhere near ovulating when I had , right, since I was still on my period? And, yes, I know that spern can stay in the body for up to 5 days.) Anyway, my boyfriend always pulls out, but this time he thought a little came out when he was pulling out. I got paranoid. So, right after , I went to the pharmacy & got my birth control Rx and took two pills immediately. Then, about 67 hours after that I took Plan B. I am still feeling nauseas and having abdominal cramps, & it has been a week since I took Plan B. Should I be worried? Could I already be experiencing pregnancy symptoms, or is my body still reacting to all the hormones?? I'm so scared! Help!