Possible STD...

so me and my boyfriend had sex today and im currently flipping shit because ik he hasn’t been w anyone in a long time and I haven’t either so I don’t understand. I have a itching, burning, almost pulsating pain down there.. the only logical thing I can think would cause it is the lotion I put on my legs / lower stomach an hour before I saw him.. i don’t want to worry myself ragged thinking it’s an STD... but I truly don’t know what to do and I need help, please leave your thoughts.

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Update: I’m bleeding. i shouldn’t be rn. and it’s very light colored. I’m sorry for the TMI, I’m just desperately looking for advice.