Hello and welcome,
The risk of
pregnancy with emergency
hormonal contraception use is very low. It isn't ask low as with daily use of The Pill, or an IUD, but risk is still low.
By now though, if you were pregnant, a urine pregnancy test would be positive. So if it isn't positive, you aren't pregnant.
Emergency hormonal contraception such as the
I pill is a big dose of progestin, and many women find that their cycles are messed up (come early or late or spotting) from it. So not having your period now, or having an irregular period for a couple of months, is somewhat normal with I pill and does not mean you are pregnant.
For the future, consider a regular form of contraception such as The Pill or an IUD, so that you don't have to worry. The I Pill and other forms of emergency contraception are really only meant for emergencies (such as the condom breaking as you described), but otherwise, use a regular form of contraception.
So... if preg. test is negative, no need to worry.