Huge hugs, this is so stressful for you. I know you don't want to have the injection, I would feel the same, I just wanted to say that when we are trying for a baby and things have gone wrong, days feel like weeks and months feel like years, I have had two MMC's so I understand the loss, anger, fear, disappointment you feel. It is also really important that the doctors look after your health, you need to make sure you are ok, it may be that taking the tablet will keep you safe, if you are worried ask for a second opinion, also ask that if you take the tablet how can you confirm how long you have to wait to try again, do they do a blood test?
It's scary and the thought of having to stop for 3 to 6months when you have just experienced a loss is overwhelming, I'm 43 and hoping to have my rainbow baby so I understand time pressures, after my second MMC my thyroid went underactive we had to wait 4 months in total and looking back now the 4 months went fast even though I was upset at the time. My consultant said the most important thing was my health.
Sending you big hugs xx