It can also be from your hymen tearing some more.
That area is very very clean. Normally you do not get it infected.
Wear cotton panties when you have to, go without panties when it is safe. This will keep you dry and airy. Avoid tight pants and heat. Spray yourself with a small spray bottle after peeing, then pat it dry.
Take NSAID pain killers if you need to.
If it gets worse, or you think you got an infection like yeast or a UTI, you will have to speak to your mom.
I hope you are being safe!