kinda panicking

Heya all so yesterday morning I had sex with this guy and last night I had some white discharge with a little blood in it but it hasn't happened again yet so can anyone help me to know what it is? 
Oh and I don't know if this helps but no I'm not on birth control,no it was not rough sex , I finished my period about 7 days ago and not due for another period till 3 weeks and my period is regular