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Hey,

I understand that this is a scary time for you!

I'm wondering if things were a bit too rough when you had sex or if you didn't use enough lubrication? If you are not wet enough, it can definitely hurt! If that's the case, try some foreplay before sex and also remember there's no harm in buying a lubricant beforehand. If things are too rough or a certain position causes you to hurt, try different positions to see if that helps you not be as sore next time. Things like that can cause soreness. It was your first time, so your body still may be getting used to sex.

I'd keep an eye on the lump and the pain and if it doesn't go away I'd definitely go to a doctor.