This is because implantation occurs about a week before the period and the blood would have been released a few days before it appears as a discharge.
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Images. Brown discharge at early terms of pregnancy may be provoked by implantation (the egg's invasion into endometrial lining). Brown vaginal discharge during pregnancy is also a sign of infections.
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Also, brown discharge can be due to implantation and an early sign of pregnancy. Having a little amount of brown discharge during pregnancy is common and isn't a big cause for concern, however it can also be a sign of some types of infections. The first trimester consist of week 1, week 2, week 3, week 4, week 5, week 6, week 7, week 8, week 9, week 10, week 11 and week 12.
Sometimes, it can be an early indication of pregnancy or perimenopause.
The discharge is caused by the bleeding which is light and slow. The brown discharge during pregnancy is caused by the normal implantation process that usually occurs some few days after ovulation. If your brown discharge increasingly becomes bloody and persistent for days then it is likely abnormal. Usually this discharge is very scant, it appears earlier than the expected period, is not accompanied by pain, but can give rise to other early pregnancy symptoms.