3dpo and exhausted (possibly progesterone?)

Once again, I'm in a tww. My third IUI was this past Sunday. I'm totally exhausted! I mean, I can't even function by 4pm. Yawning, eyes closing, struggling to get through my work day. I didn't have this last IUI. Is anyone else experiencing this? I'm thinking it's from the progesterone. I'm on endometrin. However, I was also on crinone last cycle and it didn't effect me like this. Yawwwwn, man am I tired. Lol

Update: my Dr confirmed Monday and Wednesday my beta doubled. So it worked! I'm not out of clear yet but this is great news so far!