My mom has set me up with an appointment on Monday to get this in my arm. She asked me when the last time I had sex i lied and said since my first boyfrien which was about 3 years ago. I just had sex tonight, and she said they can tell when the last time I had sex, is she lieing or can they really tell. Because now I am worried and idk what to do and I have made a stupid choice!! Help me please!!!