Thanks for the query.
Recent illness can sometimes affect the menstrual cycle by affecting the hormonal
Just by symptoms we cannot confirm or rule out the pregnancy
As you got two urine pregnancy tests
negative, there is somewhat less possibility for pregnancy.
You once consult gynecologist and get examined. May be you need one ultrasound
to find out the possible cause for delayed periods.
After that you can tablets for withdrawal bleeding.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429