thanks for using health care magic.
Pills are an effective method of contraception
and have to be taken on a daily basis in order to be effective. They provide contraception from the very first day if started on within the first five days of the menstrual cycle or after 7 days if started on another day.
From the information you have given, it shows that you started the pills within the first five days of your cycle thus your contraception was supposed to have started that same day. However, irregularities in taking the pill such as missing the pill or not taking at the same time daily could lead to reduce effectiveness.
Brownish red discharges are not a normal findings and you should see your doctor for a vaginal smear for testing. Also, it is advisable to do a home pregnancy
test to be sure of the pregnancy status.
Hope this helps you.