LH surge before AF?

I feel like this month was a waste just because I accidentally started my progesterone too early. I thought I had ovulated but when the doctor checked my uterus on ultrasound she said it looked like I was about to ovulate. Anyway today (a week or two after my doctor telling me that) I decided to take an opk & it was positive today on cycle day 31. I used to have 35 day cycles before my d&c so I wasn't sure if they'd still be that way so I'm hoping that this means I'm about to start & we can try again soon!