Hi and welcome to HCM.
If you have taken the emergency
contraceptive within 48-72 hours of the unprotected sexual intercourse, it should work in preventing
pregnancy (provided you were not sexually active without protection after taking it). Since the pills contain high doses of hormones, these can disrupt the normal
hormonal and period pattern causing period/bleeding abnormalities and appearance of new symptoms.
Sine condom was broken at the time of sex, you done right thing by taking
i pill. Your next periods may be delayed or their may be slight bleeding like what you are having now.
If pregnancy is suspected consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum
HCG level test (to confirm/rule out pregnancy accurately). If pregnancy gets ruled out and if you are not ready for pregnancy, but intend to remain sexually active, you should consider getting started on suitable regular birth control measures to be protected (after periods).
But i believe that you have very less chances of pregnancy.
Regards
Dr Santosh