I think that depends on you more than the doctors.
You tell them what you want to tell them.
On the Nhs website it says "It is a good idea for a couple to visit their GP if they have not conceived after one year of trying", but my GP tried insisting on 2 years.
I suppose that your m/c does kind of count as a conception, but it's bs if they use that against you.
I waited all of 5 month and i'm so glad that i didn't wait any longer, but at the same time i had a rational reason to have concern because of my husband - i knew he was going to be a constant source of trouble from the moment i met him lol
To be honest though, i kind of think i would have seen the doctors by now anyway.
We pay about £50k in tax every year and i don't really see what i get for it. I'm never ill, i can't find an Nhs dentist and i'm buggered if i'm not going to take advantage when i need to.