Goodgirl, I just asked Dr Google and it came up with a pharmacy website that stated there was no evidence that taking iron supplements and aspirin together causes any problems. Many pregnant women are given this combination. Indeed, if I became anemic during pregnancy I'd be put on iron pills in addition to DOUBLE baby aspirin, a super strong 5mg folic acid dose AND blood thinning injections on top.
I understand that you are upset about your miscarriage and are looking to see whether there is a cause so that you can eliminate it in your next pregnancy. But in my honest opinion I think the ER doctor you saw did not know what he was talking about and has got you worked up for all the wrong reasons. Maybe instead of getting a lawyer you could make an appointment with another obgyn for a review of your case? Get them to look at your bloodwork and give them all the information you can get about the pregnancy to see whether they would change your treatment plan for your next pregnancy. Hopefully, as this obgyn is more qualified to talk about the subject than the ER person or your lawyer this consultation will put your mind at ease that you didn't do anything wrong to hurt your baby.
Take care, hon. It's not easy xxx