Sometime 24 days sometimes 28 days circle am having how will i assume ovulation date?this month i got period after 24 days how will i count ovulation

Chart it out: Mid cycle with 3 days either side are considered the fertile times. If i were you i would consider both time which would give you over a week when you would be most fertile.

Irregular cycles: With irregular cycles, ovulation timing can be tricky. Counting from the first day of your period, with 24 day cycles ovulation is on day 10. With a 28 day cycle ovulation is on day 14.