Welcome to HCM.
Well the details provided by you about your follicular Growth study are incomplete. The study should start latest by 7th day of the cycle to assess the condition of the endometrium and follicles, before they start to mature. Starting follicular study
later than this could give misleading interpretations. If the dominant follicle has been regulary increasing in size in the serial study and then reduces in size or collapses with fluid in the pouch of Douglas, then it is an indication of ovulation and right time to have intercourse to increase the possibility of successful conception. Endometrial maturity also plays an important role.
If every thing is normal, then certainly you could conceive naturally, and you do not need medication of any kind. Time your intercourse between 12th to 18th day of your cycle, provided your cycles are regular.
Wish you a Great success.