Thanks for your query.
It is not uncommon to have slight variation in menstrual cycle. It can range from 24 to 34 days. Variation ca be due to stress
imbalance or any other unknown cause. Lower abdominal pain
, menstrual irregularity and infertility
may suggest Pelvic inflammatory Disease
, which should be ruled out. If you have never had a child before and it has been about an year with unprotected sex or you have had child and you have problem with conceiving again than you should visit your doctor along with your husband.
Difficulty in conceiving can be due to many factors related to you and your husband. So detailed history and thorough examination can catch the problem and doctor can help you.
Hope it helps.