Yes retrochorionic haematoma is the same as subchorionic haematoma - the former is what my original erroneous scan was changed to (from retroplacental).
I think my bleeding has settled now, for which I think the carpets are grateful as there’s going to be enough scrubbing them after a little one arrives, never mind me putting red footprints and puddles all over them.
It is interesting to look at what the Royal College of Obs & Gynae (kind of like the governing body of that type of doc) calls spotting, minor, major and massive bleeding. Spotting is streaks noted only on underwear or pads, minor <50ml (only 10 teaspoons although blood always looks more than it is on the floor or persons - we regularly do mock ups to train our junior docs to estimate blood loss accurately and they are usually at least 3-4x overestimates to start!); major is up to a litre but without clinical features of shock; massive >1l with shock.
To put in perspective, a whole period is about 35ml on average (Range 20-80ml), spread over 3-7 days. Or try tipping an egg cup of water in the floor and see how alarming it looks!
I had 2 major bleeds at 11 & 12 weeks, and the rest of the time has been just similar to a heavy period until the last few days of a bit in the morning and then just spotting.
I did do bed rest until the significant bleeding had settled but am now just avoiding sex and heavy lifting/pushing/pulling etc. There is one small study that supports it, but one has to bear in mind the corresponding increased risks of DVT & PE from immobility. I was careful to do lots of calf exercises whilst laid up.
It is a really common condition and most resolve by 20 weeks. In general, the medics are not interested in it because there is nothing conclusively proven to change what happens. I think a lot of people miscarry in the first 12 weeks for other reasons, usually aberrant chromosomes, but attribute it to the SCH so it seems a lot more scary than it should. After 12 weeks our odds of successful live birth also massively increase, just like those without a SCH.
I’m feeling loads more settled now that I know mine isn’t near the placenta, is getting smaller, and also I’ve got myself a Doppler and that has been a great reassurance to hear the heartbeat everyday. I know nearly all the professional organisations are against home Dopplers but I figure I am a trained professional so pretty unlikely to mistake any sounds of mine for the baby.