Short LH surge

I've been testing with Wondfo strips 2x/day. Sunday morning I got a neg (but getting progressively darker) but BD around 3 pm. Tested again around 8pm and got pos. Monday morn and evening were both + but wasn't able to BD. This morning (tues) strip is negative again. Does this mean I ovulated yesterday? Was BD timed ok? Worried I missed it even though I've been testing so diligently! Any reassurance would be awesome! :)