I found a bump on my lady parts what should I do

Okay to just get some things taken care of it is NOT an std that I know for sure I’ve only had sex with one man my fiancée and we’ve both been tested what I’m scared of is it being like a spider bite or something it hurts and looks like a pimple almost it’s never happened before I’m currently 19+3 pregnant and it might be a hormone thing but I’m just scafed it could hurt the baby I’m scared anything can hurt the baby

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