Hormones can be bastards. Among all the stuff they cause to women is a vaginal discharge. It is mostly caused by high concentration of Estrogen.

Should you be concerned?

As stated on Krenizdravo Website: Is it (the discharge) Normal? Yellow discharge after the period does not always have to be a cause for concern, as it is not so unusual, especially if there are no accompanying symptoms. After the period, vaginal canal cleansing occurs naturally. Yellow discharge in that period is a sign that you are fertile and that ovulation is on the horizon. And now, in case you wonder when your ovulation should happen: Ovulation and Fertility Test More about the female hormones can be found on netdoctor.