What do you think my chances of being pregnant are? (Chart included)?

i have a question plz help : really try'n 2 have a baby .. LMP was aug 11- baby making on 18th 19th 20th an 21st .. had a P on sept 7th 1 day then did it on sept 19th bf had 2 leave town 4 2weeks.. so any chances or wait until next mth ty all