You could not say that it was a miscarriage
, its just an accident and do not think much more, when a female is near to her mensuration bleeding a slightest jerk can cause bleeding even sometime a sudden fear or shock
can cause bleeding and it does not not mean that she never be pregnant, you just wait for next month ovulation and try it again perhaps under the consultation of gynecologist.
Keep happy and do not take any more tensions
Dr. Deepak Sharma