Thanks for the query.
Yes, sometimes friction due to intercourse can lead abrasions over the vaginal mucosa.
That can lead to minimal spotting.
Sometimes post coital tears can occur.
In that case, the pain and bleeding can continue for few days.
You didn't mention your age. With progression of age, due to fluctuations in the hormonal
levels, moisture at the vaginal mucosa can decrease and can lead to dysparunea.
So better to use vaginal lubricants during intercourse.
This will decrease the friction.
If you are nearing the menopause
, better to consult gynecologist once and with her advice can go for estrogen