Ttc help

Amanda • 30years old A momma of two handsome boys 👶🏽 ❤️ first born is 7years old born April 22 2016 and a 3year born July 15 2020 my angel 👼 baby July 16 2023
Hello my name is Amanda n I been ttc for two years already last month I got my period on the 15 then ended on the 18 then me n my husband had sex 24,29,30,31, then June 1, n today June 13. I took a pregnancy test on June 8 and it came out negative. I been taking folic acid 200mg and prenatal vitamins 400mg everyday. Am I doing something wrong please help