Positive OPK with FMU

On CD 13 at 6pm I had an almost pos. opk and CD 14 (yesterday) I was going to be gone all day so I tested with FMU around 8am and got a pos opk so I figured I would ovulate later on that day. I had all the same ovulation pain as last month and the most CM I've gotten all month, so when I got home that night I took another opk around 9pm and it was an obvious neg. But this morning my bbt dropped so I'm almost positive I ovulated. But I wanted to just confirm with some ladies and see if any of you have had simular experiences, thanks!!