Ovulation when dose it happen if my cycles are 35 days?

35 day cycles: If your cycles at age 36 are regular and 35 days apart, ovulation will generally occur at day 21 (14 days prior to your next cycle). If you are "4 weeks pregnant", an ultrasound in a few weeks can reveal the probable date of conception due to the fetus' progress in growth and calculation retroactive.

14 days: Normally, ovulation occurs about 14 days before the onset of the next menses regardless of when the last period started.

14 days: Ovulation usually occurs about 14 days before your next period or about day 21 of a 35 day cycle.