Im just not understanding.

Me and my partner are having intercourse the days of my ovulation, this month i had very fertile discharge, we’ve been trying for over 7 months and nothing is happening. I have a 4 year old and im 26 I don’t have any known issues. I’ve been extremely tired these past few days but my pregnancy test are negative my AF is due in 5 days and im gassy and sore breast. Fa