When to BD

Hi ladies! Currently cycle day 20 and I finally got my positive opk! 🙌🏻 Also have a crazy amount of CM. I got my first positive this morning at 6:10, just tested again at 12:28 and it’s still positive. Do the 24-36 hours count from the first positive opk? Should we BD tonight or tomorrow? Both days? Was thinking of doing it tonight and tomorrow morning. Or should we wait until tomorrow night?