Can I consider a pregnancy test result reliable?

Hello. I have 30 day cycles, regular. On day 13 of the cycle, my partner did a few seconds of penetration without ejaculating inside. I'm very afraid of pregnancy because I'm 41 years old and I suffer from severe anxiety neurosis. 15 days have passed since that day. Every morning after getting up I took a pregnancy test, with a sensitivity of 10 ul. I'm 3 days before my period. Can I consider these results reliable?