I had a medical abortion at 11 weeks (I think the cut off was 9 but the nurses at the clinic fudged the paperwork so I wouldn't have to have a surgical procedure).
The first pill was absolutely fine, no problems at all. Me and DP went shopping in Sainsbury's straight afterwards and I experienced nothing at all.
The cramping and bleeding started about an hour after the second pill, which I had vaginally. I took lots of Co-codamol, wore comfy clothes and had a hot water bottle on my belly. I found the cramps no worse than a heavy period and they only lasted a few hours. I don't have a very high pain threshold.
There was very heavy and unpredictable bleeding though. I had huge maternity pads but these got soaked quite quickly so I had to keep running to the toilet when I could feel a gush. I got through a few pairs of pyjamas that day as well.
If your DH is looking after your baby, will you have anyone to keep you company? Not really being able to do much and having to rush back and forth to the toilet can be quite lonely and boring. I made DH play board games and watch shit TV with me all day then get me a takeaway on the night. I didn't find my abortion traumatic at all but DH's support was completely necessary.
I bled for about 10 days afterwards. The first three or four days were quite heavy and a bit crampy but not too bad. After that, it eased off and was like a light period.
I don't know about breastfeeding, sorry.