In contrast to Lunatic Fringe, there are several different approaches to repeated miscarriage than Lesley Regan - (no offence LF, just presenting a different view!)
In fact s couple of the consultants she works alongside - Raj Rai for starters - treat with aspirin and heparin and some steroids. Lesley Regan is a fantastic scientist and researcher and will only use and prescribe proven treatments which have been fully trialled. However, trialling in patient groups such as pregnant women or those trying to be pregnant, is fraught with difficulty, and PRof Regan is notoriously ultra conservative, which if you're desperate for a baby, isn't always the best approach.
So a different approach is to treat 'off label' as such, with drugs which haven't been empiracally proven to be efficacious in these groups - and that's where aspirin and heparin and steroids and monoclonal antibodies fall - widely used but unregulated. Those which use them - Shehata, Gorgy, Taranissi, Rai, et al, have shown extraordinary results in women with rpt mc, even those who have tested negative for thombophilic screening.
Pink Peony, from what I've read, you're right, most miscarriages are caused by chromosomal abnormalities, EXCEPT in women with repeated losses - in this patient group, the likelihood is a different issue - that of an immune related issue. So either the body is recognising the embryo as a foreign body, and rejecting it, usually by putting a clot in the placenta, or preventing implantation. Or, the body doesn't recognise the foetus as being quite 'different' enough, especially if there are genetic similarities with both parents, and it's rejected, with a similar mechanism. The theory behind the treatment is that aspirin (and heparin) thin the blood, and prevent clots, and the steroids/mc antibody/immunoglobulin in some way affect the immune system enough to allow the embryo to implant and thrive.
I've rambled a bit, sorry. I just wanted you to be aware of some of the developments in this area. Hopefully this was bad luck rather than a serious issue, but please don't think you've got to keep plugging away without success when there are other options available. x