Since u are 35, underlying causes for  absence of fetal heart should be evaluated...if cause is evaluated and found next pregnancy will be smooth. There is no need to panic

We cannot predict next pregnancy from previous one if it has happened only once. There may be multiple reason for the loss. But you need to consult doctor in  preconceptional period  for proper guidance and smooth running of your pregnancy

First time also it was an accident. An accident can happen again.

There are possibilities

If you have previous pregnancy loss then chances of getting bad pregnancy outcome is low in next pregnancy but as compared to female with live birth your chances slight increase (I mean it depends on history of any disease, bad habits, any surgical history , and other personal history) So please consult nd get advice Do regular checkup and anc visit with doctor this will keep u and yr baby healthy.

Yes It is unpredictable how the subsequent pregnancy will go Re

Please consult for proper discussion.

Cant presdict can go absolutely normal or can have issues