I have blood in my discharge(in between period) & i'm worried as i've had cancer before (it was hodgkins) should i be worried? this is the 1st time.

Have to be concerned: It may not be related . At 25 your bleeding may be related to your hormonal imbalance , not recurrence , but you must speak to your oncologist and gynecologist and rule out not related to your previous hodgkins

Keep an eye on it: Hodgkin's is a disease of the lymph nodes and would rarely if ever involve the uterus or endometrium. Keep on eye on things and if you have anything else unusual see a board certified ob/gyn. They can perform any needed tests such as an endometrial biopsy if clinically indicated.