I miscarried my identical twins at 8 weeks but still haven’t passed them..

I went in for my 8 week ultrasound almost 4 weeks ago & found my identical twin girls no longer had a heart beat and one of the twin’s heart had grown outside of her body. The dr said it could take up to 4 weeks to pass naturally but I’m just wondering if anyone has ever passed naturally later than 4 weeks? I really thought I would have passed them by now. People I’ve talked to who have experienced miscarriages all passed their babies in 2-3 weeks. I’m becoming anxious and impatient. I just want to pass them already.

Also, did anyone struggle to get pregnant again after their period came back? We got pregnant after trying for only 1 month this time but it took us 6 months to try for our first daughter so we were so happy and in shock that it happened so fast this time but devastated that it ended so quick.