TBH I had no problems with the steroids - it isn't evidence based & I'm not 100% convinced that the treatment/NK thing is relevant to my losses given the lack of evidence (e.g. I've only had peripheral levels tested not intrauterine) BUT I don't really care - when I've followed the evidence I've had losses & I believe that medicine is as much art as science - if you've found a consultant who is willing to work with you then you're doing really well.
After the twins I was pretty sure that I wouldn't have IVIG again - for me that was a step too far (apart from the £1000s it cost I had a pretty bad reaction to it) - so I'm not completely reckless.
I have hyperemesis too & the steroids have the fabulous side effect of controlling that (on the down side I put on weight - 5-10kg in 12 weeks use, am hungry all the time & have increased facial hair which sucks & doesn't seem to go away post pregnancy). It's never affected my blood sugar levels or BP which is a potential risk. My pregnancy regime is:
positive test - begin aspirin, clexane, cyclogest & prednisolone (I have a supply at home when I'm ttc). I take high dose folic acid when ttc that continues.
5 weeks - blood tests for platelet levels (because of clexane), book scan for 6 weeks.
6 weeks - scan - see consultant continue meds if gestational sac present.
7 weeks - re-scan - if heart beat present continue meds - 25mg pred, 20mg cleaxane, 150mg aspirin, 2 cyclogest suppositories (can't remember dose is it 150mg?)
weekly scans until 12 weeks then start weaning from pred at 12 weeks - off completely at 14 weeks (stop cyclogest also).
Then scans x2 weekly until 20 weeks - then have fetal med anomaly scan - they check for cleft palate (potential risk from steroids) & have first of placental function (doppler) scans.
Scans continue every two weeks until birth (with my last pregnancy there were signs that the placental was crapping out at 28 weeks so I had weekly scans) & doppler studies done monthly. I have elective section booked for 38 weeks but have CTGs done 3x week in day assessment from 35 weeks.
The biggest worry that my consultant had was the clexane - she's advised no more pregnancies (I think another pregnancy would kill me because of the effect on my bone density).
I don't know about testing - I have been tested for everything repeatedly and have never had any real answers - I got to the point that I just wanted to try something & was happy to accept the risks of some unproven treatments.