Could I be pregnant?

I had sex two weeks ago.. It was my first time. When he was entering for the first time he didn't used condom but then he put it on (he used Trojan). After that we continued and he came inside (he was using the condom). Now the doubt if I'm pregnant or not it's eating me alive. I'm not very good remembering the dates of my pasts periods because it's irregular and I didn't put it on the app. So I don't know when I'm suppose to get the period. I'm thinking like if I don't get the period in two weeks (that will be a month after I had sex) do a pregnancy test.