Clomid, and Ovidrel, and Preseed, Oh My!

So this is only my second month TTC but I took clomid 50mg on days 3-7. Now, Dr wants me to take ovidrel shot tomorrow (day 13) if I don’t get a positive opk by tomorrow morning (because of the follicle size right now). I’m also going to be using Preseed because I’ve heard a lot of great things about it. My question is this: if I am taking ovidrel tomorrow when do I start the BDing? I’ve heard you want the sperm already in there waiting on the egg. I can call the office tomorrow but I want to know if we should BD tonight or not. Thanks in advance.