Welcome to HCM,
In a virgin female, spotting/bleeding can occur during first intercourse, due to rapture of Hymen
If your boy friend is unable to insert his penis fully, you might have a thick hymen.
As it can be confirmed through examination only, please consult a Gynecologist.
In my opinion you should avoid unprotected sex with your boy friend. Condom can prevent transmission of STDs.
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Hope you found my response to your query informative and helpful.
With good wishes,
Dr.Chandra Shekhar Sharma