Actually my doctor told me that bleeding lightly and cramping after intercourse is normal. If you're cramping and bleeding heavily then yes go to the hospital, but she said that's normal after sex because of something with the cervix. Forgive me that I don't remember exactly, but I had the same problem.
Well since its during brown its probably gonna stop..u didn't say if iu had intercourse or not because u could possibly just been sensitive up there. It happens sometimes. If it doesn't stop then call your Dr againhe doesnt mind its the weekend they probably get several calls, their use to it