I can't be very accurate, as I am a virgin, but if it smells like fish or smells bad in general it could be a bacterial infection. Im not sure if it is normal, because again I've never had sex. It could just be blood mixed with other fluids, but if it smells bad its probably a bacterial infection. Some girls bleed after they have sex for the first time, so it may just be harmless. I recommend getting advice from someone who is NOT a virgin.