BETA #2 and Estrogen Levels

We got the results for our second BETA today: 693. If you don't remember, our first BETA on Monday was 420. The nurse said that even though they like to see it double, the doctor was OK with it and for us to schedule our ultrasound at 6 weeks. For my reassurance, I am asking to have another BETA on Friday. I also have no idea when we are 6 weeks. How do we determine how far along we are? My menstrual cycle was controlled by Lupron so I didn't ovulate when I should have so going by that date would not be accurate. I was going by three days before the date of the transfer as the day I ovulated since the embryos were transferred at 3 days. That would give me an ovulation date of 5/22 (transfer was 5/25). Does this make any sense?

Another concern of mine is my estrogen level. Though never formally diagnosed with an estrogen deficiency, I have been told my night sweats are caused by the drop of estrogen before my cycle. Before we started the medications and such for our first transfer in March, the night sweats were pretty much under control with birth control. However, since not being on the birth control consistently the night sweats have started back up again. About a week before my cycle starts I wake up 1-2x a night soaking wet and freezing. Sheets, pillow and pajamas. This cycle the night sweats started at the same time, about a week before my cycle was to start, however, they stopped Friday night (implantation?) only to come back Saturday night (and continuing).  Even though I take Estrace 2x daily, I can't help but think my estrogen level is low due to the night sweats. While I am not sure the exact role estrogen plays in pregnancy, I am sure it is important or I wouldn't be taking the Estrace, right? I am asking the doctor about this, too.

UGH. Seriously. Satan is constantly finding ways to attack us. Please pray that he DOES NOT win.

I will update when I know more....