Hallow Dear,
Yes, theoretically, the regular menstrual cycle is defined in the books as a cycle of 28 days with variation of 7 days on either side; so the span is between 21 to 35 days. Any cycle beyond these limits is defined in the text books as irregular cycle.
One day beyond the text book definition may not be a hopeless situation. If you are releasing your eggs regularly, you can conceive.
The best way to get the evidence of ovulation is to go for ovulation monitoring. Though ovulation monitoring home kits are available, I would advice you to go for
ultrasonography for the first few evidence of ovulation.
Ovulation occurs 14 days before next expected menses. So in your case, it would be day 21 of the cycle. Subject yourself for ultrasonography for ovulation monitoring from day 17 onwards. Do this for consecutive 3 months.
If you get the evidence of ovulation, you have all the possibilities of
pregnancy.
If you are not ovulating, you will have to undergo complete
hormonal profile -
Thyroid and reproductory - to assess the cause behind it. So better report to a Gynaecologist in such case.
I hope this answers your query to the satisfaction. For ongoing advice, you may ask me Direct question on this forum.
Dr. Nishikant Shrotri