I got periods again after 9 days of my period.... but the bleeding was light and they remain for 4 days... now i feel weakness and sleep too much... i am trying to conceive from past 4 months but nothing happens?

Prolonged period ?'s: First, a post ovulatory "period" is not usually "9 days long". Light bleeding thereafter may indicate a pregnancy outside the uterus (ectopic), so obtain a serum HCG test to be certain about pregnancy. If positive, see your physician immediately to determine the location of the pregnancy. If negative, and the bleeding persists, see your gyn physician for an exam and other testing.