Frustrated

Feeling a bit frustrated. My fertile week started Tuesday and my DH and  I started the BD, Sunday and Tuesday. We tried last night but it just didn't happen, it was hot we were tired and we just couldn't get in the groove. This morning my opk was positive. We are going to BD as soon as we both get home from work, but hey say you should be dancing before the positive opk, and testing 2 x a day during your fertile window. While I know there is still a chance I feel like we may have blown this month. :-(