Pulled out method has failure rate of 15 to 27%. However, emergency contraceptive
pills gives more than 95% protection against unwanted pregnancy
if it is taken within first 24 hrs and around 85% within 24 to 48 hrs.
Brown discharge after taking the pill is quite common due to its withdrawal effect. However, your next period may be delayed 1 to 2 weeks due to hormonal
imbalance. You must repeat the home pregnancy test after 2 weeks from due date. Early test is less significant.
Practice safe sex
in future. Good luck.