I had two in my twenties, in the days when pregnancy tests were not available over the counter (or if they were they were too expensive for a very junior postgraduate). With both I had only just worked out what had happened by doing some counting back on the calendar, and had got as far as contacting BPAS for a termination as the relationship was casual and motherhood was not a good idea at this time, but nature took its course before the appointment came through. Since my GP wasn't involved I doubt these would be in the statistics. With both there was a vague sadness but also a sense of relief that I didn't have to do something about it after all, and most of all a determination to be less lacksadiasical about contraception (obviously I was still a bit lacksadaisical otherwise the second wouldn't have happened...)
I had a third in my late thirties when my twins were four. This one was recorded, I had got onto the system and was booked for a twelve week scan. I lost her/him at 11 weeks and was very upset.
It was the expected date of delivery that triggered it really when I think about this. I hadn't had one the first two times, but knowing when the birthday would be likely to be made this baby far more real. It was the anniversary of the Battle of Waterloo and I'd been winding DP up by threatening to call the baby Arthur after the Duke of Wellington.
So, four pregnancies and three miscarriages here.
I have talked about all this with my mother and sisters. Ma had nine pregnancies four of which ended in m/c. Sister no. 1 four pregnancies, two ending in m/c. Sister no. 2 one pregnancy, ending in m/c, sister no. 3 five pregnancies, 3 ending in m/c.
All our m/cs were around 10-14 weeks.
When I have talked about this with friends I have always had the impression that this rate of miscarriage was about normal and that was why most women didn't announce they were pregnant until the end of the first three months.