Sure, you could have ovulated late. Most women are late with their period starting from time to time. Things that cause us to be late include stress, changes in routine, illness, weight gain or loss. Have you had unprotected sex?
Ovulation is the lead event and the period is the end event, not the other way around. The last period doesn't start a cycle that causes ovulation, instead, ovulation starts a cycle that then causes a period. The body sloughs off its uterine lining 14-15 days after ovulation, even for women who are irregular in their cycles. This means if a woman has a 28-day cycle, she might expect to see ovulation on day 14 and a period on day 28, but if she has a 60-day cycle she would expect ovulation to be around day 46 and the period on day 60. (She wouldn't expect to split the difference and ovulate on day 30 or anything.) The period is doing clean-up work of an unneeded endometrial lining, and then the bod ovulates again when it happens to feel like it, and it might be whenever. Then the period comes 14 days later. Anyway, if you ovulated a little later than usual this month and now your period is a little later than usual, it sounds like you're seeing a normal time lapse.
Please question: if my period day is dropping by 5 day what could my ovulation day e.g i had my period for January on 10th, but for the February is 5th what could my ovulation day. Can this cause un-pregnancy?