I had a scan on CD 10 which showed 4 follicles all doing nicely. I was expecting to O either yesterday or today but I haven't. I have had neg OPKs both days. I think I'll get a pos OPK today and will O tomorrow as my temp has dropped which always happens before I O.

My FS said if I get my surge tomorrow that we should come in for IUI.

My question is, if I O tomorrow, is it too late for IUI? I know if you BD you need to get there before the egg but I'm not so sure with IUI, help!