Sorry to hear your in this situation 
I found myself in a similar situation around 3 weeks ago and found myself unexpectedly 4 weeks pregnant. I contacted MSI and booked in an initial appointment over the phone. I had a 15 day wait for this.
During the first appointment, I was asked my medical history, reasons for the termination and then offered an in person appointment for 3 days later.
When I went to the second appointment I was nervous but everyone at the clinic was extremely reassuring, kind and understanding. I had to have a scan, the nurse/midwife couldn't find anything at first so did a transvaginal ultrasound. After this, they explained the process, the risks, discussed contraception (information regarding access to their service, no pushiness) and then she handed out the medication in an unmarked bag. There was the option to take the first pill at the clinic, i believe either due to medical reasons or morning sickness.
I took the tablets home and prepared to take them when I had a spare two days. I took the first, I had a few small cramps but that was it. Then 24 hours later I took the 4 pills, there is a choice between letting them dissolve on the gums or vaginally. I opted for the latter as I was advised there may be less side effects. I placed them in, and sat for about an hour to ensure they stayed put. 10 minutes before this, I took cocodamol, then some ibuprofen some time after that. After the initial hour I did get strong cramps, but no bleeding.
3 hours later I had little bleeding and so took the final 2 tablets on my gums- let them dissolve for 30 minutes and then swallow the rest.
I will admit, this really ramped things up for me. I was sick twice, and the cramps intensified and I am used to painful periods, but then I haven't had children so this may factor in to the pain I felt. I did begin to pass the pregnancy at this point. However, once this had passed (over an hour or so) the pain decreased dramatically and could relax with a hot water bottle. I am on day two now, have no cramps and it just feels like a heavy period now. I feel more like myself already, and even though I had some sad moments in the wait for the termination, I do feel a sense of relief now.
A few tips I would give:
Have maternity pads- they have been brilliant at stopping any leaks.
If you can, try to go to the toilet when you feel the blood 'pool' so you are more likely to pass things in the toilet and you do not have to see anything you don't want to. This also helps with leaks too.
Have someone nearby that can support if need be- I found it reassuring knowing I had someone to call if I needed anything.
Ask for pain medication- I was advised paracetamol and ibuprofen would suffice and I really wish I had asked for something stronger. I think this would have made everything a little easier. I know some providers are brilliant at this already, and may even provide anti-sickness tablets too.
Definitely a hot water bottle! Aside from helping the cramps, the warmth was comforting, almost like a hug.
It isn't an easy situation to be in, nor is it pleasant but when you know it's right for you, that helps massively.
I wish you all the luck and hugs OP.