at this point treat your kidney infection obviously and then follow up on things. you can get tested for std's while you have your period - makes no difference at all. What is important is that you waited enough time between the last time you had sex and getting tested. do you know what they tested you for too?
odds are herpes wasn't a part of your std testing. you should follow up with a type specific herpes igg blood test 3 months after the last time you had sex. if you have a regular partner, ask them to go for a full std screening too and to specifically request herpes igg blood testing with it.
being on your period and now being on antibiotics can also increase your odds for a yeast infection in a few weeks. follow up with more testing as needed.
grace
no but i was diagnosed with a kidney infection
Don't think that tests are altered from a period, because they look for specific things.
Yeast does sound like a good explaniation. Did you have an exam done?