Do not panic hun! You can't be 100% sure. What are your symptoms? I had terrible cramping when had my m/c 2 years ago. Are you bleeding heavily with clots? Do you feel like the cramps come and go (contractioons like)? If you have any of these symptoms - get someone to take you to emergency unit. It can be serious or could be nothing as many women bleed through their pregnancies (including me). Whatever happens just remember - there is nothing can be done! Nature has it's own way of telling us about it. I wish you all the very best of luck.xx
Call your doctor and if necessary go to the ER.