Hiv test after 34 days. Understanding!

I have some different question.I did hiv duo test for embassy 3 months back and value was 0.23 (cut off value is 1). Now, i had sex with person and she hurted her hand knee( no oral sex and no risky sex) so some blood came from her hand knee. We did nt realize but after we finish i could see some blood drops in bed and i was witbout cloths in bed.So some doubt came in my mind. I did testing again after 34 days of exposure and its negative with 0.268 value. So here is my question is hiv duo test accurate after 4 weeks but suggested to take again.But in my case 3 months back value was 0.23 and now after 34 days of exosure value is 0.268 no significant rise. According to my knowledge if raise is significant then only need to again test but in my case value is still same means in this 34 days no significant raise so no need to test again..kindly advice...i request all to provide correct answer because people are leaving with lot of scar of hiv so please answer on my understanding