Am I still in the run for a baby this month?

Okay I took clomid on CDs 3-7 and I looked on an ovulation calculator which showed I should Ovulate between May 18 through May 21. Well I came across a Clomid Ovulation calculator yesterday and its saying I will ovulate on May 15th through the 20th. We did the BD 14th and the 18th. But there are 3 days that we did not and during the 17th I started to get cramps in my ovary but my husband was to tired to BD. Do you think I missed my window? Or do I still have a chance. We really want a baby but my husband is in the Army so he is tired at night when hes home and normally we don't have the luxury of having every other day, but we've been trying to but I think we messed up. What do yins think?