Preparing for inevitable miscarriage

I was super excited to have an early BFP had very mild pregnancy symptoms and a low initial progesterone level of 7 but I still had hope. I retested progesterone a few days later and it went up to 13.4. I was put on progesterone vag tabs. Went in for my 6 week 2 day US which showed I had 2 gest sacs! Twins! Unfortunately one sac had no pregnancy in it and the other had just a yolk sac. No fetal pole or heartbeat. I was already anxious because 7 years ago I had missed AB at 7 weeks, and now another unsuccessful pregnancy (vanishing twin and a missed AB). I’m 35 and was told my low AMH and high FSH were not good fertility hormone levels. I was referred for IVF but decided to try on my own first since I just was having hormones checked not actually TTC at that time. On our first valiant effort it worked! So that’s a positive but unfortunately not viable. Wondering if I should do a D&C; at this point to test the embryonic tissue or just take a medication to miscarry. The last miscarriage was so long ago but just wondering if I have a medical issue that’s contributing.