Don't know when to bd

So Friday I tested and was negative opk then I went away for the weekend and had no tests with me so I didn't test Saturday or Sunday. Now on Monday I tested and got a flashing smiley face on my opk which is high fertility. I BD Saturday morning, & Sunday night without thinking about O. Now I don't know if this is the first day of flashing smiley or 2nd or even 3rd 😬