Sure why not get checked, never a bad idea when sexually active to know your status.
See a Dr and get a diagnosis, you asking questions that really don't have specific answers.
if she is negative? should i still get checked?
how long is too long?
what are other signs and symptoms worth noting with the pimples?... that would leave to believe more than just a pimple?
i have had one before. but not 2 at the same time.
is a week after the last we had sex too long for symptoms?
Sorry, but we aren't the lab technicians working on her tests. So, we don't know any more than you do. Pimples could be several different things including things that are not std related.