I usually do have normal period/menstruation. but this april, i had two period, first was april 11 and the second was april 30. is it normal?

Maybe, maybe not: An early menstrual period may be caused by changes in hormone levels, which can be due to anxiety, stress, overworking, intense exercise, fatigue, or excessive weight gain/loss. If pregnancy happens, implantation bleeding occurring 9-14 days after conception may happen, and sometimes may last long enough to mimic an early period. An ob-gyn doctor can check, if symptoms are worrisome or recurrent.