My wife had miscarriage on 14th may and started heavy bleeding with some tissues coming out and cramping since then (went to obgyn and the doc said she would finish miscarriage naturally).
She stopped bleeding and cramping on 23rd may. On 27th May, we had unprotected sex but I didnt cum in her.
On 1st June, we had another unprotected sex but I didnt cum in her either.
I am worried she will become pregnant again considering she had miscarriage recently and probably needs more time to recover before her next pregnancy.
So, She took postinor 2 on 1st June and today (2nd June, 12 hours after the first taken).

My question is
1. Will the postinor 2 be effective for the unprotected coitus interruptus on 27th may and 1st June to prevent pregnancy?
2. Was 27th may sex possible to result pregnancy?
3 is taking postinor 2 considered safe after miscarriage?

Thanks and Regards,
Herman