Hi there,
Thanks for your question.
It is difficult to say how worried you should be, as with any kind of sex there is always a risk for getting a sexually transmitted infection (STI). Condoms do make sex safer though.
To get to know your chances of getting an STI, take a look at this chart: http://smartsexresource.com/about-stis/know-your-chances-0
You will see that all STIs mentioned in the chart are easily passed with condomless vaginal sex.
As for testing, it is best to wait at least 2 weeks before you get tested. All STIs have a window period, or the time it takes for the infection to show up on testing, and the window periods can vary with each infection. So, testing done immediately after a riskier event will not be accurate.
When someone does become infected with an STI, they often do not have any symptoms. So it’s a good idea to get tested regularly or when a riskier event happens, such as a condom breaking.
Here is more information on ‘when to test’ and ‘window periods.’
http://smartsexresource.com/get-tested/when-to-test
Please let us know if this has been helpful or if you have any further questions.
Health Nurse