Hello, There are so many reasons of infertility in spite of proper ovulation or follicle rupture. These include progesterone deficiency, uterine & cervical factor, tubal blockage, thyroid deficiency, husband abnormal semen etc. Yes, siphene will help you to bring regular cycle and conceive. You have to regular unprotected sex for 6-12 months close to ovulation day or fertile days to maximize the chance. You can use ovulation prediction kit. Along with, you must take folic acid & vitamin-E supplement with balanced diet. If fails with above treatment, you must consult with infertility specialist to proceed relevant investigation to rule out the exact cause. Good luck.