When should we BD?

amy • unexplained & hashimotos . ttc #1

This is my first round of letrozole, we did the midcycle ultrasound yesterday and my RE said everything looks great and I would O in the next few days. Well she was right! I just got a super positive OPK this morning 😄

She said when I get the positive we should BD that night (tonight) but idk if we should do it tomorrow too (we're concerned about it being "diluted") or wait until Thursday?