You can consult a gynae. That's what I did when I'm trying for my second child. Basically what my gynae did was to check for my ovulation period and after my period, I went for a follow-up visit and I happened to have my ovulation on my 2nd visit so on the day itself(even though the ovulation kit I bought showed that I'm not ovulating), my husband and I just tried out. One month later, I was found pregnant. Hope this help =)
My period cycle is 28 days, I fount that my ovulation date is on one of the days of 14th, 15th, 16th. So maybe day 14th or 17th would have higher chance I think.