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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.’
Please let us know if this has been helpful or if you have any further questions.
This answer was posted on September 14, 2016