Hi

2 weeks ago i had anal sex with csw ( i know her for a long time ) for about 2 min max . I think it was 1 min.at some point I realized that the condom was broken and the tip of my penis was exposed. I dont know how long i was exposed inside her. Both we were afraid and she assured me that she was not infected of any std's and hiv, but we both agree to take the test for the peace f mind. After 3 days we both get tested negative and since I know about the window period I asked her if she had any dangerous ancounter the last months and for one more time she reassured me that this happened to her for the first timeand that I dont have to worry. Unfortunatelly even I know the odds from a single episode of Insertive anal are very little I am still very worried. 

What do you thin are the chances that she actually been infected the last 2 months so the test she had wouldnt show that she was positive and what are the chances to be infected from an exposure like this ( broken condom ) 

Thank you in avance