If you hit your belly can it cause a miscarriage?

NO - unless the fall causes serious injury to you. This is especially true in early pregnancy. It is worth a mention to your Dr. nonetheless. If you start spotting or have any cramping (that you previously did not), you should contact your Dr. immediately. Yes. any kind of injury to the abdomen can cause miscarriage if severe enough. If you begin spotting or have any pain at all, call your Doctor immediately. It would probably be wise to inform your Doctor anyway. If you have not yet established with a Doctor, the sooner the better. It is highly unlikely you would do any harm as the uterus is still in the pelvis and therefore extremely well protected. Any pain or spotting is unlikely to be allied to the fall. there is not a lot the doctor can do about it anyway, it is a bit the case that 'what will be, will be' at this stage. Even later in pregnancy a fall is more likely to hurt you than the baby. It is possible yes but the baby is usually protected by the amniotic sac and this is very strong and protective towards the baby. But see your doctor to get checked over.