BD before IUI?

A

So I am on CD3 right now and will start Letrozole today (5/2). Then I have my follicle scan on CD 9 (5/8). My doctor will be out of town 5/9-5/10 and they don’t do IUIs on the weekend so we will have to wait until Monday, CD14 (5/13) to do the <a href="https://glowing.com/glow-fertility-program">IUI</a>. He is crossing his fingers that I don’t ovulate before then but obviously we won’t know until after it happens. So what’s the last possible time we should have sex before the <a href="https://glowing.com/glow-fertility-program">IUI</a> just to make sure we have some swimmers up there just in case I do ovulate early?