beaglemom, I almost had the same issue with this cycle since DH and I have to go out of town next weekend. I was afraid I'd start full blown AF yesterday or today and day10 would've fallen while we were out of town. Luckily, I didn't. I'm still only spotting, but I would think I'd start tomorrow the way I'm feeling, so my day3 stuff will probably be on Monday. Now i'm still in a bit of a pickle, because day10 will fall on the following Mon, and that's actually the day we are driving back. So when I go in on Monday, I'm going to ask them if it hurts anything to do that day10 u/s on day11 instead. I dont think I'll be an early ovulator on the Femara since last cycle was a false alarm when I got that first pos OPK. So I think even though the follie was ready on day10, it would probably be ok to have the u/s on day 11, which is the day we get back. Then i can trigger that night, and have the IUI on day 13. But I want to ask them on Mon if that's something they can do without screwing things up. She did mention that they can also do the day3 stuff as late as day4 (but no later), although I wont end up needing that. But she just mentioned it. She said in that case, I'd just do the Femara on days 4-8 instead of days 3-7, and that might put O off by one day as well. So it sounds like there's a tiny bit of room for flexibility. But I'm going to talk to her on Monday and mention my circumstances, and I'm hoping she'll say day11 is fine. She may have me take the Femara days 4-8, or she may not feel its necessary. I'll find out, I guess! I'm just glad it'll probably work out either way, because I was really worried that I was going to get AF yesterday or the day before.
Taking the P might be a good option to extend your cycle! I'm hoping you don't need to and that you'll just get a BFP and not have to worry about any of this crap anymore, lol! FXd totally crossed for you! But if not, it would be worth a phone call to your RE to tell them your situation and see if they are okay w/it.