After 12 weeks the chance of miscarriage drops significantlly. Unless you have a high risk pregnancy you are worrying for nothing. Enjoy your pregnancy and dont worry.
If you think you miscarried or having miscarriage you need to call your dr or go to ER. When I miscarried I bleed for a whole week straight and day I passed baby I had labor pains but I was no more than 6 weeks pregnant. Hope everything is okay with you and your baby.