So sorry for your loss.
I had an EPRC last week (also hate the term 'retained products'!!). I was 10 1/2 weeks and they said they didnt recommend pill over 9 weeks due to size of baby. Was ok - still some pans and obvious emotional sadness still but it was all done when I was asleep so no physical passing the sac which I dont know how I would have coped with. My main downside was they put me to sleep without saying they were about to I never felt I actually got to say my final goodbye despite the waiting before the procedure
At the end of the day you have to do what is best for you and your son (and partner as guessing from previous comment?). If you have EPRC you will need someone after - I was told not even to operate a kettle or toaster for 48hours an felt drained for a few days - did have a big drop in BP though. I had never had one before and it was all such a shock from my scan on friday and discovering no HB to the EPRC on the following tuesday - lack of time to grieve, I thought I would be fine by the friday and ok for work - i was very wrong. Still tired now - Im back at work and coping but still on early nights and not quite myself. I dont know about side-effects of the pill but imagine similar with anything as anything will evoke emotionally and your body needs time to adjust.
All the best x