thanks for your query
Actually ovulation occurs exactly 14 days before the start of next period. In case of 28 days cycle it will be on almost 14 th day. If it is cycle of 25 days , then it will be at around 11th day. In your case there are some chances of pregnancy
. If you dont get your periods then you recheck after one week. Some times , the period may get delayed in other wise regular cycle due to stress
Hope it helps you..