OP, you are getting conflicting advice here some of which is inaccurate. A medical (tablet) termination usually causes the pregnancy to be expelled on the same day as taking the 2nd lot of tablets. Occasionally takes 48-72 hours. It does not take “up to 2 weeks” at all - but it is normal after the initial very painful and heavy bleeding within 72h, to then have continued or on/off light-moderate bleeding for 2-4 weeks.
Retained products of conception is the term for any retained tissue, even small amounts, which are most often asymptomatic and resolve without intervention. Surgery rarely needed for these.
After the initial bleeding and passing of products, any heavy bleeding with large clots or pain needs admission to rule out incomplete termination (usually a collapsed sac).
It sound very much as if you have the this, which is more likely to cause the heavy bleeding you’ve had as the body tries to expel. It can also block the cervix, with a high risk for further heavy bleeding. Antibiotics are advised. You should have had a speculum examination to see if the cervix is open, and had bloods to check inflammatory markers, haemoglobin, pregnancy hormone on admission.
If so, this is in no way a viable pregnancy, and there is NO grounds for any doctor or nurse to withold any care, INCLUDING surgery - as it is no longer a termination.
I can’t stress enough the importance of getting a copy of the scan on discharge. If there is no formal report as it was done by a junior doctor in a ward setting, the accuracy sounds questionable.
I’m glad it’s hopeful you will have the surgery tomorrow - as you say, this is a much more definite outcome. Waiting longer is an option, but not one that would be advisable.
Keep posting if you need to; dearly hope there are no further problems tomorrow.