Oh dear, just wrote five massive paragraphs and then stupidly reloaded the page and lost it all! Not up to rewriting right now

so the super condensed version:
Hi Daybyday,
Just saw this, and wanted to respond since I'm in a similar boat, pregnant (32 weeks now) with POTS. I've been keeping track of my pregnancy, including some details about the supplements and meds I take in this thread:
http://forums.phoenixrising.me/index.php?threads/me-and-pregnancy-one-case-study.20445/
And before I started that, I also asked the community about the combo of pregnancy and pots:
http://forums.phoenixrising.me/index.php?threads/possibly-pregnant-and-super-potsy.19112/
The super quick version is that POTS is just worse during early pregnancy (which for me was about 4 months), and there aren't a lot of treatment options (normal meds are pretty much out according to the cardiologist I saw), so salt/water loading and compression hose (and being horizontal as much as possible), were about all (btw I think licorice is on the off list for pregnancy too). Hopefully you're through the worst by now, or at least approaching the point where things improve naturally because your blood volume increases.
And just my 2c but I doubt most doctors will be very supportive of you trying a stimulant med during pregnancy. I've seen online accounts of narcoleptic patients getting approval because the risk to the baby (from passing out and falling, wrecking, etc.) was much greater than the potential damage of the meds, but it seems to be generally regarded as a no go during pregnancy.
Oh, and do talk to your doctor about anything you are doing or trying, and there's also this resource:
http://www.mothertobabyca.org/about/ you can email them a list of any meds or supplements that you are taking or thinking about taking and they will summarize current research on the effect on the fetus. It's free (I think to anyone and everyone) and my doctor had me contact them and then bring in their information to him.
Let me know if you have any specific questions either via messages or on a thread. Good luck!