Sex rant

So I went to the doctor Friday last week to check my follicle. I took clomid this month for the first time. The dr said that my follicle measured where it needed to be, and to have sex over the next few days. So I did Friday and Saturday, then my husband worked doubles Sunday and Monday, we had sex Tuesday and Wednesday, and yesterday I got a positive opk. But last night he didn't feel good and wouldn't BD. I was so mad, and I know I'm probably being crazy but I'm so tired of waiting month after month! I've had three losses and just am exhausted with trying. What are the chances of getting pregnant with BD the night before ovulation? Is it probably just as good as if I would have done it again last night?