How long do you have after ovulation?

Okay ladies, I need your help! I got a positive ovulation yesterday, from my strips and ClearBlue digital. I tested this morning and it was faint like I wasn't ovulating anymore! We did have sex yesterday but just once. Don't you have 12-48 hours after you get a positive? I thought you ovulate for the next day at least. A few times I did feel pain today. I'm hoping we can still have sex today and it'll work! So how long do you have after you get a positive do you ovulate?? Please help!

These pictures, the first three are from yesterday when I got a positive! The last one was from last night around 2 in the morning. The top one still kinda looks positive but you can tell the bottom one the strip looks negative and today they both look fainter! I don't understand!