Positive OPK, when to BD?

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Hi, I got this positive OPK result this morning, last night it was negative, but close. We did BD last night already as well as the day before. My question is, do we still need to BD tonight? If we do tonight, do we have to tomorrow as well? Even though the OPK was negative as of last night, would BD’ing last night still result in a chance of conception of my egg is released today/within 12 hours? TTC #2 and want to get it right this time , as it took over a year with #1! Any advice helpful