Early ovulation and quick ovulation


So yesterday morning I took my opk cd13 and it was positive (smiley) 12 hours later it was negative, I figured maybe it was because I drank a lot of water during the day, so I tested again this morning and sure enough negative again. My temp spiked this morning too, so I’m guessing I ovulated late sometime yesterday? That just seems like a very quick ovulation... plus it’s about 3 days earlier than my normal. We bd pretty much every day including last night so hopefully we did everything in our power to get pregnant. Just seemed to happen very quickly, I’m wondering if I just have a small window between positive opk and the egg dropping?