TTC- hope you feel better soon. You have been giving your body a big workout, so resting sounds good.
The HCG test measures how much pregnancy hormone you have in your blood- the same one HPTs measure. It varies wildly between people (5-400 or so for week 4), and doubles every 48-72 hours. So they want to test it again today to make sure it's doubling. Progesterone helps to support the pregnancy (though I'm not exactly sure how) so they want to see it between 10-30 when you are about 4 weeks pregnant.
Lab- glad that you have one less thing on your mind
AFM- I actually was so in shock when I tested- it was the day before I left town, and I felt so guilty because I knew DH was taking care of the dog all night, but I woke up and just needed to test. So I POAS and saw the evil single bar showing up, took my thyroid medication, and looked back down at it. My first reaction was that I was squinting too hard, so I walked out into the living room where DH was with the puppy. He said the look on my face was priceless. I asked him if I was imagining it and he said no. Well, it was one of the blue dye tests which are known for having evap lines, so I told him it was probably just an evap line and not to get too excited. I had actually collected my urine (sorry if TMI), so I dipped a FRER and we both watched as the line came up pretty much right away.
He's been so sweet, but he keeps calling me baby mama. I keep telling him we're not having a baby, I'm just pregnant. It might sound like a weird distinction, but I don't want to get ahead of myself, at least until after the first trimester.