please answer would like advice and solid opinions or facts.?

I had an accident with my partner and I had to take the morning after pill the deed happened on 9th September and I took the morning after pill two hours after the deed, I then had a light period from the 23rd sept for 4 days I did however do a pregnancy test two weeks after the incident which was on the 23rd September and it was negative I then tested again with first urine of day on the 30th sept it was negative and I have tested again 2nd October is it safe to say I am not pregnant? also me doing a test after three weeks of sex does that give an accurate result?