Yes of course you can call the booker, be polite and down to earth, do not panic at the situation at hand or project a tone of voice as if the booker has any responsibility in this.
What are std like symptoms? Are they from a type of std that you could have caught through oral sex or with a condom on nonetheless?
Do not mention the girls name here for both your safety until you can absolutely be certain that she is the cause of this std.
And best of luck, inform yourself, go for testing immediately and once again in 2-3 months, and a third time in 6-8 months.
Think long and hard about what you have if you do finally have something, and compile a list of recent partners.
And once again, inform yourself to be absolutely certain that your std in question could be directly related to the breaking of the condom.
If it is any type of std that can be spread through oral sex or protected sex, it is important to find out if it could have been avoided..an agencys reputation could be on the line, and the sp's as well.