OMG - Are they serious!!!!!!!

I am going to get fired today, I have been online too much!! I just got off the phone with the nurse at my doctors office.  Answers to my questions- Sex - 4 weeksObviously use protectionyes I can use tampons next period, change frequentlysleeping - benedryl, unisom1 cycle then I can try again for babyHeadaches could be hormonal or from stress... but the kicker to all -  Do I need to come in for a follow up -  SHE TOLD ME TO GO BUY A PREGNANCY TEST AND MAKE SURE IT COMES BACK NEGATIVE, THIS MAKES ME SICK JUST THINKING ABOUT IT...  I DON'T KNOW IF I CAN DO IT!  WHAT IF FOR SOME REASON I STILL HAVE HORMONES IN MY BODY AND IT COMES BACK POSITIVE.  I DON'T KNOW IF I CAN DO IT GIRLS!!!!  HELP!!!!!!!  I DON'T KNOW IF I CAN DO IT...