If there is any possibility that infection has occured talk to a doctor or clinic about getting tested. If you have never used a condom before you might like to practice putting one on by yourself before trying it with a partner. This will mean that it is easier in the heat of the moment. It may also make you look better in your partners eyes. At first you may find it uncomfortable and strange to use condoms in a situation in which previously you never gave them a thought.
Condoms are, however, a most important part of safe sex.