@DimbleBimble really really sorry to read your post. I haven't had ERPC but am post-test-and-currently-pregnant-recurrent -mc-er
First thing I would ask is who (and How) is deciding that the first two are 'chemical' pregnancies. There is usually no mechanism of testing this phenomenon unless products are collected and tested to prove the absence of a blastocyst/fetus. So take a step back and ask how many positive pregnancy tests have you had, and of those how many times did the pregnancy not continue. I think the answer is 4 - this is what you need to tell your GP - you've had 4 MC's.
The wait for the tests depends on the trust. For me I had a first appointment 2 months after the last MC - some say this is deliberate to ensure HCG etc is out of your system but of the hospitals I was offered this was the first available appointment. I met with the consultant, we talked through my experiences and discussed possible causes/appropriate test to be done. They took bloods on the day, and then scheduled a non pregnancy scan to check the uterus is normal (about 3 weeks after). This is pretty standard. Usually you only get all the results together, not the bloods first etc I got my first results about 8 weeks after the first appointment.
Some conditions that cause MC require a second test to validate the first test wasn't an anomaly, so in my case I then had to have a second test 12 weeks after the first . . so this was about 4 weeks after I got the initial results, then a 2-3 weeks wait for the results from that which gave me a diagnosis.
So all in all - July to Nov for me. 3rd MC was in May. They advised that TTC was fine, as there is no guarantee the tests will show a problem ( I believe its about 50/50 of those that have a testable condition and those that don't) however afterwards with my diagnosis had I conceived without diagnosis I likely would have lost another one as success without treatment is less than 20%. As it happened, I found out we'd conceived 4 days after the diagnosis was confirmed, so we went straight into action stations for treatment and care pathways. I'm currently 18 weeks and so far so good. Fingers crossed.
Hope this helps if you have any other q's just shout. I had thought that scarring etc is low risk, the procedure is common but some of the other ladies here can advise better than me xxx