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Hi there. Board-certified obgyn here. Preparing a response and will be with you shortly.
Everything you've been through sounds so stressful and frustrating. I'm sorry to hear about the troubles you've had in the past.
You could still be having spotting just from the IUI procedure itself. Brown discharge is usually indicative of old blood. This means blood that you already bled, but was so light that it wasn't even enough to push itself out of the vagina, and it just collected in the vagina, and it just comes out little by little when you wipe. You probably had a little bleeding at the time of your IUI (pretty common) and that blood is just working its way out over time. Nothing to worry about at this point, and not indicative of a miscarriage. Hang in there and keep taking your prenatal vitamins.
That all sounds very promising!