I'm so sorry to hear your experience, that sounds absolutely awful. It's such an emotional mind-bend to be in, because you will do anything to make the pregnancy work, but also don't know if the very things you're trying to do to help are actually dangerous. This is my experience of CRP clinic...
We have had 3 miscarriages over 18 months. With the first two, we thought it was just bad luck, but after the third we began to worry. My EPU consultant recommended Prof Shehata as we said we wanted to go private (we'd already done a lot of the NHS investigations without much exciting coming back and didn't want to wait so long for an NHS referral to recurrent miscarriage clinic thinking they wouldn't be able to add much). So I booked us into Prof Shehata's clinic. The admin team had said he would want all the investigations to be recent within the last 3 months, so in an attempt to save money, we got the standard blood tests repeated on the NHS before going (I work in the NHS so it wasn't difficult for me to arrange). Despite this, in our first appointment, he said we had to repeat them all as we'd missed one small test (one part of the thyroid bloods, which was normal 6 months previously, but this time we'd missed repeating it) and he couldn't separate out requesting that test from all of the others so we'd have to repeat them all (at great cost, of course). I did think this was a bit unreasonable, but my husband was very keen not to make a fuss so we just agreed to paying to have them all repeated. We also got some new tests done which we were pleased about - my husband's sperm DNA fragmentation and of course the NK cells. This came in total to about £3000 (including the repeated standard ones) which we paid. On the NHS results, one of my antiphospholipid bloods had come back marginally raised which he said wasn't significant and didn't need to repeat (he claimed APS doesn't cause miscarriage, which is completely false). I hadn't managed to get karyotyping done as there was insufficient tissue with the third pregnancy, but Prof Shehata didn't ask for these results so we didn't mention it.
We went for the follow up 2 weeks later, and were given the results of his tests. All of my standard repeated tests were normal (obviously) and the sperm was normal. The NK cells had two tests - one general level, which was normal, and one test that he said replicated a pregnancy like state. My level was 0.1 above the "normal range", although how he calculated what should be normal, I don't know. I was expecting him to say "great all your results are virtually normal, that's really encouraging, we don't need to do too much, but these are the options to choose from if you want to increase your chances". Instead he brought out a booklet with a really intense treatment regime which involved immune suppression prior to trying to conceive and then monthly treatments with intralipids, steroids, progesterone etc etc which he said we would be starting on now. I was honestly shocked by how much he expected us to do considering how normal the results were and asked him (very politely) if it was necessary to do such an intense regime when the results were only borderline raised. He lost his temper and was very rude, saying that we would go on to have 20 miscarriages if we didn't do his treatment regime. We were both very uncomfortable and felt like every question we asked was shot down. He was incredibly pushy, telling us what to do, instead of giving us a choice. He then gave me a consent form to sign, which included phrases like "I understand that this treatment has no evidence for being used in my condition" and also locked us into scans at 6, 8, 10, 12, 16 + 20 weeks. I asked how much they would cost (about £300 each) and if we could have some of them done at our local EPU to save money. Again, he lost his temper and said it was his GMC registration on the line, and he had to be in total control of my care and couldn't have other people interfering. I understand not trusting a private scanning place like 'window to the womb', but I have access to NHS consultant scans at my EPU which are obviously very high quality.
Anyway, we said we wanted some time to think about it, and in their waiting room my husband calculated that with all the treatment/scans/appointments it would cost around a further £7000. Like the OP said, this is not about the money - I would give all of my money to have a successful pregnancy. It is about feeling manipulated and taken advantage of. We felt we couldn't trust Prof Shehata and apart from anything I don't want that man anywhere near my vagina doing internal scans. It would also mean being on and off steroids every 2 weeks until we conceived and then for many months of the pregnancy which made me uncomfortable. So we left the clinic and said we'd be in contact if we wanted to continue, but decided over the next few days that we didn't want anything more to do with them. On talking with medical friends, we think he is driven by one of two things: 1) exploiting as much money as possible and/or 2) getting good results for his statistics - we had virtually normal results, so he probably thought we had a good chance of normal pregnancy anyway, and by giving us his insane treatment regime he could claim our next successful pregnancy as his win. He wouldn't be able to include us in his statistics if he didn't do all the scans etc.
As it happens, I'm very glad that we left - we have since had parental karyotyping done showing that it is a balanced translocation that caused all of the miscarriages. He never asked about our karyotyping results and so would never have discovered this if we hadn't gone back to our EPU consultant and asked for that test because we weren't happy with Prof Shehata. Instead he would have charged us thousands of pounds for entirely useless treatment, that might even cause harm to the baby and definitely can't be good for my body.
This is just one experience, but I would say to anyone considering CRP clinic to stay completely clear of it. We are glad we got my husband's sperm tested, but apart from that, it was a complete waste of money and we very nearly got manipulated into having unnecessary and potentially harmful treatment.
Sorry this doesn't help much in your situation, but I think it's important to share our experience for other people considering CRP clinic. I hope you can make peace with whatever you decide. I know steroids are used in some conditions in pregnancy, including extreme hyperemesis and my EPU consultant said they are safe for the baby, so hopefully everything will work out fine for you, but I totally appreciate how worried and uncomfortable this whole situation is making you.