curious

Hi I would like to know what date of sexual intercourse led to my pregnancy. I have irregular periods and the last period I had with normal flow was April 2-5, then I experienced light bleeding on April 22. My and I had sex April 23,24,25 and the last was on May 8. On may 31 , my pregancy test showed positive. I had my first ultrasound on June 10 and I was 8 weeks pregnant (uterine pregnancy 8 weeks by crown length) accdng to the diagnosis. And my ultrasound due date was January 20,2020 but my LMP due date was January 27 2020. May I know which sexual intercourse led to my pregnancy, the April ones or May?