Most Helpful Girl
If you have had unprotected sex, and/or are planning on having unprotected sex, yes, you should get an STI screen. This is standard, to ensure you don't pass anything onto a new partner, and to ensure your own sexual health as well.
Is she a virgin? If not, suggest you both go get tested. Better safe than sorry. Most common STIs are curable, but can cause major complications if untreated.
Most Helpful Guy
No she's not. That's a lot. Get tested.