Hello ma'am,
You will have to be clear that was this your first time doing coitus or have you done it earlier?
If it was the first time then this is quite normal and you need nothing to worry about.
But, if it is not then too normal vaginal bleeding because of frictional injury during coitus is quite normal.
Next Steps
There is nothing wrong with you and I would advise you to maintain the hygiene and if in case you feel any sort of discomfort contact a good physician.
Health Tips
In case of any further help feel free to contact any of our clinic.
In case you feel more comfortable with a lady doctor then too we would be happy to help you.
Take care.