My last lmp on July 14 after that I had intercourse on aug 5 and missed period also .again sep 7…

My last lmp on July 14 after that I had intercourse on aug 5 and missed period also .again sep 7 onwards I had intercourse and sep I missed period also and sep 28 pregnancy checkup show negative in blood and urine tests. Again October I missed period and oct 28 pregnancy show positive and 7 weeks then which intercourse help me to become pregnant #myfirstpost