Pregnacy test

Olga

My week ovulation just past i had sex 4 days of 5 and end it tonight when should i do a pregnancy tests on oct 15 am i wrong or not ? I hope this will be my month im so amuse btw im taking metformin since 3 weeks ago can this be helpfull wht u think. Any opinions please 🤷🏻‍♀️🤷🏻‍♀️