Hello! You should probably talk to your doctor. An individual person can't really answer this question, but a doctor trained in this specific field will be able to assess your situation and come up with a list of potential causes of why you miscarried last time. Then he/she will be able to help you in ways not to miscarry. It will most likely be bed rest and a certain healthy diet. Also just a quick tip that a lot of woman seem to be disreguarding: take folic acid tablets to help your growing baby and make sure to stray away from lots of caffiene (which includes chocolate)

Try and keep a healthy diet and don't do anything too strenuous until you speak with youra doctor.
Hope that helps.
~*~Maui~*~