exactly what she said... at a certain level, the HCG stops rising and you'll see that in any b/w you do. I don't know why it stops rising but it's a signal to the body for other hormones to start activating so perhaps once the signal is strong enough, your body stops producing it. (Just a layperson's theory there... lol)
Everyone's HCG levels are different. Mine started out lowish (53 on day 9 after 5dt) then 160 on day 11. We never tested again after that. I had a super high HCG (in the 10Ks) once, but that was on a blighted ovum pregnancy. The rising/doubling/tripling is much more important than the actual number, and your numbers are very solid.
You don't need to worry about your HCG numbers any more. Just stay rested and hydrated. The meds made me really tired, so staying off my feet was easy. Any time you're tired, lay down. Take it really, really easy. No heavy lifting. I even avoided lighter lifting like bottles of laundry detergent, groceries, etc. You need to let that embryo get all settled and comfy in there - and sounds like he/she/they(?) is/are doing just that.